Making body mod cc/animal crossing mod?

Right now, after seeing this furry mod: , I've been very interested in making an animal crossing mod and a cartoon character mod. How would I go about it as an absolute beginner? I'm not even sure how I'd approach the 2d eyes and creating the body, much less getting clothes to work. Some examples of body modification I wanted to do are these sorts of characters:

marketplace.secondlife.com/p/NAM-ChiBEE-21/14407375

marketplace.secondlife.com/p/NAM-Chibi-Bun-Bun-v2/6047631

marketplace.secondlife.com/p/full-perm-Bear-Doll-mesh-avatar/6460623

marketplace.secondlife.com/p/Berrybird-Tired-Tabby-LATTE-OmegaFoxcat-mod/17569065

Cartoonish character:
marketplace.secondlife.com/p/Utilizator-Anime-Head-M3-retex-fullperm-v2/4770844



marketplace.secondlife.com/p/free-summit-eyes-kemono-m3-anime-head/6086646

Basically, are there any good tuts that teach you making extremely morphed characters for the sims, similar to the way safestate did it?
or pre-existing mods that fall into these categories?  Most of the CC tutorials are based around hair and clothing, and I haven't found anything if you're trying to do body modification in the form of sort of creating a whole new mesh with cc. Where would I begin? Thanks! Any advice helps!