You're gonna need some way of producing mutagens yourself unless you want to pay a lot for them. You can find mutagens in ancient dangers, and mutagenic ship parts will drop slurry (which can be used for a number of things).

You'll need some slurry to get going, as it's the most reliable way to have one pawn produce both cowmorph milk and chookmorph eggs. Alternatively, try your luck with a production serum (or the base mutagenic serum) -- to make your own slurry you'll need a cowmorph and a chookmorph.

Slurry can also be obtained by refining mutonite, which is mined from mutagenic meteors. If you haven't disabled it in the mod settings, these meteors can give mutations to anyone who gets close, so be careful.

I'd also recommend picking up some stabilisers and production booster pills where you can get them, as you'll be able to boost the production of your morphs as well as prevent them from going all the way,

You'll need 5 cowmorph milk and 5 chookmorph eggs - disallow them in your meal prep. They're set to only be eaten if there's literally nothing else. After that, do the research to where you can extract slurry from eggs and milk. Once you've done that, you can either give a pawn the slurry directly, or hold onto it to make some more defined serums with further research.

Eating the slurry might result in a chaomorph, a type of chimera creature, of which there are three variants: chaofox, chaocow and chaodino. The chaodino lays chookmorph eggs, and the chaocow makes cowmorph milk. Careful about that dino though, they are very hard to train.

With slurry, there's a lot of things you can do. When you unlock the Mutagen Bench, you can create injectors to get specific morphs, you can create reverters and stabilisers with neutroamine...lots of things.

One special resource again, is mutonite. With it, you can create the Mutagun, which shoots syringes filled with mutagen to quickly transform pawns from a distance -- works well on raiders. However, this does come with a chance that the transformed pawn will become a manhunter!

Reversion Syringes are important, for if a pawn is captured, they may be sold back to you as an animal. Keep a few of these on hand (but careful, they are very rare) to change pawns back into their human selves if they've become a beast, or to clear out any mutations that remain. It can also be used to revert any wild animals with the 'former human' status effect, visible in the health tab. However, it will not work on animals which are fully wild or "permanently feral" -- a status effect given to pawns whose mutagenic mechanite friends have decided to purge themselves from the pawn's system...leaving them stuck as an animal forever.

I hope this guide helps, and I'll try to keep it up to date with future additions!