Just bought a turtle and not sure what to feed it help anyone?

I just bought a baby yellow belly slider and right now he/she (still not quite sure if it's a boy err girl) is in a 10 gallon tank. I've had pets before but never a turtle and i have questions. What do I feed it? how often? what should the water temp. be? Does anybody know any websites where I can get more info on YBS? help? thnx! :)