New gitz, need help building a 2000 pint army

Pretty new to age of sigmar, I've started playing spearhead and am trying to expand out to a full 2000 point army after picking a few things up off Marketplace.

I need advice on building a list and also spells as that isn't something I've had experience with in spearhead

Gitzy Boys 1910/2000 pts

Gloomspite Gitz | Troggherd Drops: 3 Spell Lore - Lore of the Clammy Dank Manifestation Lore - Dank Manifestations

General's Regiment Skragrott, the Loonking (230) • General Dankhold Troggoth (180) Rockgut Troggoths (190) Rockgut Troggoths (190)

Regiment 1 Loonboss on Giant Cave Squig (120) • Loontouched • The Clammy Cowl Sneaky Snufflers (140) Squig Hoppers (170) Squig Hoppers (170)

Regiment 2 Loonboss (110) Loonsmasha Fanatics (130) Moonclan Stabbas (140) Moonclan Stabbas (140)