Legalities of starting a Holdem tournament at a Pennsylvania Bar.

Hello,
My Boss is interested in starting a weekly holdem tournament at his bar in Doylestown, Pennsylvania. He wants to do everything by the book as he just wants to bring people in to make money off liquor, not poker. So, he asked me to look into all the legalities of the idea. So, i was wondering if you can charge some sort of buy-in for everyone and reward with a cash prize. Is it legal to reward with a cash prize. I just want to get this thing rolling and any information would be greatly appreciated.