Joining the horde! Help a brother out?

Hello team Ork!! I’ve admired your awesome models for years and have decided to make the leap to the green horde bc they are just too fucking cool (am I right??!!). I currently play Deathguard, Grey Knights, and Imperial Knights and have never dove into a Xenos army with so many unit choices. Sure I could buy everything but that’s too expensive, could but what I think looks cool, but that’s not competitive, or buy whatever the current meta is but that’s boring and I never do that.

All that said, outside of Boyz, the Coptas, and Gretchen (maybe one of the best units in the game for their cost), what else should I focus on for my new favorite army??