Raising a baby bird ?

Ohk, I found a baby bird in my front yard this morning. We get alot of baby birds so I got a rehabilitation license last year. But since i got it after baby bird season was over, I really don't remember how to care for one. I have him in a cage with a makeshift perch and some water. He's not really moving. We have to go out and buy food for it and stuff but before we go I'd like to make sure that I get the right stuff. What do you suggest? Thanks, kaylee