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Looking to be building a 30 point MoComp force for a tournament at the end of the month and it’s my (and my son’s) first ever competitive event so could do with some guidance.

With it being 30 points then I’m leaning towards Khorne, we’ve got enough to make a 20 point exclusive Stormcast Eternal army, but at 30 points we’d then be adding Seraphon (Lord Kroak & a Carnosaur probably).
Currently we have the following available for Khorne:

Archaon – 7
Bloodthirster of Unfettered Fury (the double axe one) – 3.5
Mighty Lord of Khorne – 1.5
Bloodsecrators x 2 – 1 each
Bloodstokers x 2 – 0.5 each
Bloodwarriors x 10 – 1 per 5
Wrathmongers x 5 - 1.5 per 5
Skullreapers x 5 – 1.5 per 5
Bloodreavers x 40 – 1 per 10
Exalted Deathbringer - 1
Skulltaker - 1
Skarr Bloodwrath – 1.5

This comes to 27.5, I’ve then got a few Skaven to choose between, I was thinking of dropping 1 Bloodstoker to add in 3 Stormfiends to take it to 30 points (and provide some needed firepower), alternatively I’ve got 2 Khorgoraths but I’ve just not found them that good so far.

Guidance would be appreciated on if this looks about the right force and general tactics to play with them? I’ve seen somewhere the idea of putting the unit of Wrathmongers in the middle of the Bloodreavers (as well as the 2 Secrators) to give the Reavers +3 attacks each.

What missions are you playing?
You have lots of Heros in your army. You need to check if units/infantry are required to secure mission objectives.

There's usually a mix of missions, I wasn't particularly clear in my OP in that each battle is 20 points worth from the 30 chosen (so there's always a 10 point sideboard).
I'll only be using 1 of either the Bloodthirster or Archaon in a battle and it'll be the core troops that fill the remaining 20 points with Skulltaker v heroes & Skarr v mass troops.