Please help me?

i started to play golf awhile back. My score is now 72 (par is 72). sometimes i get -1. How do i get started on becoming a pro golfer? I want to join PGA and enter PGA tour. I'm 18 not in college, in WA. Does it cost lot of money? I won couple local tourment. They're too easy for me and barley get any money out of em.