Going to start by saying I don't of a Garter or Ribbon Snake as of yet. I do have a Ball Python, King Snake (BlkMex), Milk Snake (Nelson), and two Corn Snakes (live together in 30Gal), and I'm looking to buy some Garter Snakes (or capture is you all so say its fine).

First Question: Do Garters live together in communties or just pairs for mating?
Two: I don't have any pictures of my idea yet (will aquire pics/drawings when home), but I have a small thee-drawer vertical bin thingy (brain fart) in my room (I have a snake rack and cages) and I want to convert it to a 'rask' and link the three drawers together by ramps on the tops and bottoms (so they could crawl imbetween.)
Does this already sound like a bad idea or does it seem like something worth looking into more?
Three: What species is best? All have there own attributes and qualities, but I want to hear yo'all. Which are smallest (generally)? Best temperament? Etc?
Four: Anything else I should know? Want to make sure they are happy and healthy so I joined up here.