Well, if you're in school there should be several genuine contests available for you to compete. As far as becoming a professional, I say you should continue writing and search for an agent. Here is a site where you can send in quarries for an agent: http://www.querytracker.net/
Search around on that site for agencies, and see how palatable their conditions are for you, what they're looking for, etc. Also, try emailing some prominent poets--many eminent authors enjoy responding to aspirants. If you need additional assistance, feel free to email me. Good luck!