Yeah, it's got its issues (the spelling errors really annoy me, too), but it's a fun site and the art is excellent.
crazed, you can change pet color using potions, like spectrum potion and reborn potion. Galactic pets are different; they can only be created on the 6th and 7th of every month and you have to dig for gems in the
coda caves and then pay a guy in gems to bless your pet (there will be a link in the caves at the proper time).
vivian58, clothes are sold in the main shops, especially the clothing rack and the accessory bin, but there are also wearable books and things available from various shops. The creatures are mostly staff customs that will run you a few mil and can be rsed in various shops or bought from trades.
This is kind of a bad time to join, as Subeta isn't fully working because of a certain website that's attacking it with denial of service attacks, spam, obscene comments and smails, plus other stuff. The Subeta owners shut some functions down for now (this is probably why you new people can't see the forums; this website's members were registering new accounts solely to post obscene things).
SubetaDB is also down right now, but it has item lists that include every wearable item under the sun (with previews of what they look like on your avatar) and all minions, weapons, etc. There's also a WikiBeta, but that's down right now, too... sigh.