best advice would be to get a snake that suits ur situation and ur wants i guess.
if u have limited space go for a childrens, stimson or spotted.
you will also have to consider heating
and you will need at least one hide if not more.
as well as your actual enclosure.
and water
and food (usually frozen mice)
and substrate (ground cover, eg newspaper)
also whether you want one from a hatchling size, or as an adult. or somewhere in between.
you should also buy from a breeder and make sure that it is healthy and feeding on thawed rodents before you buy

there are lots of snakes for sale on the website so check out the Forsale section.