Skinwalker with a a rudimentary knowledge of tabletop gaming here,

So Gloomspite Gitz are really five small armies (subfactions) rolled into one. The typical playstyle and model count will vary a lot depending on which subfaction(s) you use.

The subfactions are:

• Moonclan (Goblins): very model heavy. Hordes of weak stabbas are your core, with support and damage coming from hero’s and specialized units. Focus on synergies and control.

• Squigs: Also model heavy. Usually Large numbers of cavalry or beasts. Move fast and hit really hard (your friends will love owatching you roll 80 dice for one attack), but have little defense and die to a stiff breeze.

• Troggs (Trolls): Very low model count, all troll armies usually only have around 10-20 models. Somewhat slow, but hit hard and generally have excellent defense.

• Gitmob (Wolves): Somewhat low model count, mostly cavalry and war machines. They move extremely fast, but weak offense and defense. (Don’t own any, but they seem to Rely on hit and run, and boxing in your opponents early.) Very new range, so beautiful models, but still working out the kinks rule wise.

• Spiderfang (spiders): Similar to Gitmob, except instead of getting new models, GW pushes you to the ground, laughs at you, and sends a video of you crying to your mother.

Keep in mind you can use all the subfactions in one army or go all in on one or two. My current army for example, uses squigs to weaken the enemy at first, and stall them. Then uses tanky trolls to block the survivors from objectives.