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Looking to start out a mechanicum force as my first 30k army since I'm happy with the 40k armies I have. Mechanicum appealed to me through their tough units and low model count and the models are gorgeous. Below is my planned list but I'm happy for advice as all
I own is a Magos Dominus and the book for them.

Magos Prime, Archmagos, Malaga, Machinator Array, Abeyant, Cyber-Familiar, Rad Grenades, Rad Furnace, Mastercrafted Chainfist and a Powerfist

Magos Dominus Mastercrafted Rad Cleanser

5 Thallax Cohort
5 Thallax Cohort
5 Thallax Cohort
2 Castellax Class Battle Automata with Darkfire Cannons and Enhanced Targetting
2 Castellax Class Battle Automata with Darkfire Cannons and Enhanced Targeting

Thanatar Class Siege Automata
Thanatar Class Siege Automata

One possility was to drop the Rad cleanser and a unit of Thallax cohorts for a unit of Scyllax Guardian Automata to join the Archmagos

So any advice would be appreciated

Based on your proposed list, it looks like you're going for a legio cybernetica army?

However, have you considered the ordo reductor? They are billed as a tank heavy force but actually, you don't need to take tanks at all! The ordo reductor list has a really great rule that means you ignore terrain and any penalties associated with it (admittedly only things like ruins, buildings, trenches etc). This is great when combined with thallax since they are jet pack infantry so no dangerous terrain tests when they jump around! I've had so much fun playing thallax in an ordo reductor list. And despite all of the cool robots mechanicum can take, believe me when I say that thallax are your heavy lifters - they are great troops and can be kitted out for just about anything. They win you games.

Also, don't overlook myrmidon destructors. Give them grav imploders or irradiation engines and they lay waste to anything! Ursarax, upgraded to have power fists are S10 and can also take on just about anything. With such powerful units, your opponent will rightly need to deal with them, leaving your thallax to scoop up objectives. Ignoring terrain will also greatly help myrmidons and ursarax.

Macrocarid explorators can be used to transport your myrmidons who have relatively short range weapons and with AV14 hulls, auxiliary drives, armoured ceramite and flare shields, they can get to where you need them. Another bonus that ordo reductor has is that your tanks are scoring in the opponents deployment zone. Again, ignoring terrain helps massively with this as they can't get stuck on their way there!

The ordo reductor FOC allows you to take 4 heavy choices and their named HQ - Calleb decima can take a macrocarid as a dedicated transport too so you have plenty of space left for the afore mentioned myrmidons.

By all means, go for legio cybernetica but I've found that the babysitting you need to do is just a headache and realistically means that you've got to invest in more HQ choices and they aren't cheap once you upgrade them. Ordo reductor lists just let you get on and play.

Castellax with darkfire cannons are very good, but only when you have enough of them to guarantee the Lance rule will really make an impact - so three or four in a squad is great. If you give them enhanced targeting arrays and give your HQ a dijinn skein, you can reliably ignore gets hot on the darkfire cannons which, in a squad of 4 castellax means you're getting a lot of shots off without the worry of taking unnecessary wounds.

Also, don't underestimate the usefulness of cyber occularis. Those things are jet pack infantry so can quickly move across the board, again ignoring terrain in an ordo reductor list, and move into little nooks and crannies near your opponent, further reducing their cover saves which stacks with thallax and enhanced targeting array equipped units ability to reduce cover. Thanatars also benefit from this trick as it stacks nicely with their grav wave rule (and enhanced targeting array which you can give them). Cyber occularis also grant interceptor to units nearby which is great early game as it offers some protection from alpha strike lists utilising deep strike. The thallax inbuilt ability to deny infiltrators from setting up within 24" combines nicely with this so even going second is not much of a blow if you wanted first turn.

Hope that helps?

Yeah that's some great advice I'll have a read through some of the units you've suggested and see what I can chop and change. My current list is based off what I like model wise haha I have very little experience with 30k as a game so any advice is welcome


Automatically Appended Next Post:
I should probably say this list is 1850 which is my clubs normal size game

Consider a paragon blade on the hq as well as an abyant. You need some dedicated anti tank the dark fire cannons are not real consistant. Consider a krios with the pulsar fulsil or vultrax the fmc robots. Enhanced targeting on the thanatars. Run thallax in 3 or 6 with weapons either phased plasma or photon thrusters. Stock lightning gun don't go far vs infantry. Also your hq needs a squad or transport. It can be hard to cover all the bases in 1850 30k is really designed to be a biggrt point value game.

What unit would work well with my Archmagos, if I swap the powerfist for a paragon blade and stick him with scyllax maybe cause they all have Rad Furnace then?

Never go wrong with a blob of Adsecularis Covenant to take high ap lookout sir hits, don't forget to make them fearless.
Scyllax are pricey for what they do but can be a good flamer unit with transport, sadly we lack assault vehicles.
I like to use a jetpack and stick them with thallax but you lose t6 options and thus can be ID from s10/D weapons.

People who prefer a shooty hq vs the stabby one you made often use Myrmidon Destructors since they share the Preferred Enemy (Everything!)

Adsecularis Covenant is ur best bet for footslogger, rite and carapace 20 strong hq at the head.

What point limit would you suggest going for?

I'll get a unit of tech-thrills to soak up wounds for my Archmagos and make sure he gets where he needs

2500-3000 is usually the norm

I'm not convinced about sticking your magos in with adsecularis. Maybe if you fill out multiple troop choices with them, it's ok. Personally, I think that 1 unit with the fearless upgrade is useful for camping an objective so long as they're in good cover but preferably if they are behind Los blocking terrain.

A magos, fully kitted out so that he's t6, 2+/3++ is much more useful in proactive units because he can tank a lot and confer djinn skein to a unit. He's great at helping myrmidons survive in a tanking role or, as previously mentioned, with a unit of castellax and darkfire cannons where he can help negate gets hot rolls.

Your magos doesn't need to 'be' anywhere. By that, I mean he doesn't need to be near objectives. He supports other units either with djinn skein, cyber occularis or for tanking. Plus he can repair wounds with battlesmith or cyberthurgy in a cybernetica list or taghmata list. And a big unit of castellax can still be used in a reductor list - he just can't join them but clever placement overcomes that.

The other thing with adsecularis is that they don't fight well, especially when made fearless as they can't over watch. You want thallax as your troops. So long as you upgrade them with photon thrusters or plasma fusils they will chip away at marines, forcing blind checks which do work and have the mobility to avoid retaliation and claim objectives.

Ymmv of course depending on the rest of your list but mechanicum can build a hell of a lot of different types of list. In my experience, where you have a low model count which mechanicum do, use your HQ to do more than help adsecularis survive.

Secutarii pelastats are an option now 2 and reroll 1s on armor saves.