The AP reflashes you ECU allowing for better performance. Read the above link for detail.
I wouldn't get a BOV as it is not needed and will make your car run funny. Plus its pretty rice. Go with a short ram intake from cobb or SPT. They are easy to install, it will let you hear your stock BPV, and even better you will actually hear your turbo spooling. You shouldn't see any power increase from the intake but you will enjoy it more than a BOV, trust me.
Read around and see what you find. Lots of great info on this site. Most of us have spend several hours, weeks, months and even years on this site and most of us are still learning stuff. We expect you to do the same. Have fun and good luck with moding!