I'd highly recommend buying the Leopard Gecko Manual -- great book with lots of info
I've got a caresheet on my website that I'd like to think is pretty decent
http://www.geocities.com/geckohaven
For a 1.1 pair, I'd recommend at least a 20 gallon long tank -- the more space the better, but a pair should be fine in that size of a tank as long as you've got a few hides in there.
Keep in mind that you shouldn't house males and females together until they're both of breeding age/weight -- males 10+ months, and females 1 year + -- both should be at least 40g -- especially for the female, bigger would be better. In general it's not a problem for males and females to be housed together as long as they get along ok, and you're prepared to deal with any babies that may be produced.
Hope that helps a bit
Leos make great pets, and I'm sure you'll find them pleasantly easy to care for after keeping chams!
Jen