Wanna get a garter snake (I know nothing...)

[spaztik]

The subject title pretty much sums it up...I wanna get a garter snake, but i know virtually nothing about them(or any other snake for that matter)
How often do i feed them? What size tank do they need? What do they need in the tank? What do i have to do to keep it alive and healthy? etc....I think you get the gist of it. Any, and i mean any advice is appreciated.