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Here is my 500 points of Iron Hands, it is my first actual, physical army, I plan to push it up to 750 for my Iron Hands.

HQ
Chaplain: Gorgon's Chain, Crozius, Plasma Pistol, Jump Pack

Troops
Tactical Squad: 5x Models, Plasma Gun, Sgt w/ Bolt Pistol, Boltgun
Tactical Squad:5x Models, Plasma Gun, Sgt w/ Boltgun, Powerfist

Fast
Assault Squad: 6x Models, Sgt w/ Powerfist

500 points is very tight for a balanced list - something usually gives!
But I would strongly recommend a cheaper HQ choice (lose the upgrades especially the comically overpriced plasma pistol) e.g. Barebones Chaplain (+ at most a JPack or Bike) or Librarian or Techmarine if 2+ saves are allowed in your local rules (often it's 3+ and up at 500).

The next glaring issue is your lack of mobility. I would think of tackling that in 1 of 2 ways:
1) Is your 500 points the start of a bigger force? e.g. 1500/1850
If so aim towards a Battle Demi-Company and Eventually a GSF.
So Chaplain or Captain as HQ,
Then two 5 man tactical squads in "Rhinos" (but get Razorback kits and magnetise the hatch/weapon) - the Rhinos will do their job at 500 points---> but once you get to 1500/1850 and have 2 Demi Companies and an Auxillary Formation your transports are free.....so for a Mech chapter like Iron Hands you can get multiple free Razorbacks and upgrade them to las/plas for only 20 points/squad!
Your third squad could be Devastators - magnetise the weapons --> at 500 points MLaunchers are very versatile but at higher points there are much better options in my opinion! Or an Assault squad (possibly in a drop pod)

2) Your second option is to build a list that's maximally mobile and point efficient at 500 points which includes things like:
1) Librarian on a bike
2) Bike squad with Grav guns (relentless, T5, FnP)
3) Scout squad(s) with CCW in LSStorm
4) Landspeeder with TML/HB (stay at max range!)
5) Scout/Landspeeder spam.....



Automatically Appended Next Post:
e.g.
HQ
Chaplain + MB (95)

Fast Attack
Assault Marines x5 with Eviscerator + Flamers x2
Drop pod (140)
(Chaplain goes with them)

Troops
Tacs x5 Meltagun, Combi-Melta + MB
Rhino (130)
Tacs x5 Plasma gun, Combi-Plas + MB
Rhino (135)

500 points exactly ---> personally I'm a bikes and landspeeder person, so other smarter people might well shoot down my suggestions