If you need help picking the right stuff, the easiest would be to buy this kit or buy the products invidiually, but change the lamp to a 25w (if you want to provide a basking site) and get some plants, this is what I have and works well for 6 fire-bellies. Water should be in the 70sF.
http://zoomed.com/db/products/EntryD...343&SearchID=5
Fire-bellies are one of the most easiest amphibians to keep and forgiving to mistakes, it's all a learning process of trying different things to see what works and reading books and taken notes. If you want an easy amphibian to set up and maintain I would get a Whites Tree Frog, they don't need a large section of water and just a water bowl.