Welcome to Subeta :)

What do you mean by 'how to get pets'? As in you want pets species/colors that are not available via adoption/making your own? Or do you mean you would like to change the species/color of an existing pet?

There's a bunch of things you can read through, including SubetaLodge which has a list of all the species and variations of pets.

Useful Links:

What to do on Subeta? FAQ Useful general information for newbies Finding friends (Chit Chat) SubetaLodge (Offsite item database, pet colours etc.)
Current site event: Masquerade