I would highly advise you read this sticky thread and fill out the "form". It will give us alot of information to work with.
http://www.tomshardware.com/forum/353572-31-build-upgrade-advice
Also, and AMD APU is not the greatest chip for gaming. I would actually say it's pretty bad at it. A lowend CPU and lowend dedicated GPU will get you much more than an APU. We also need to know how cheap and what components are needed, if OS is needed, monitor, case, opticals, etc.