Well the belts could be two things. With the weather getting a little colder the belts are going to get a little brittle and either they are cracking/wearing out or one of your tensioner pullies is loose. Just look around on the side and find the tensioner points. Usually it's the Alternator and the Power steering. If the belt is bad, then it should be obvious :bigthumb:
The oil leak could be numerous things. Could be the oil filter, oil pan, oil drain plug, misc. hoses/gaskets. The best thing you can do is get the Oil die from Autozone. Wipe off everything under the car then run it and watch with a black-light. It will be BRIGHT green where it's leaking from. Pretty easy to spot. Then you'll be able to diagnose where it's coming from and I can tell you how easy/hard it is to replace.
-Trevor