How do I realize my boating dreams?

Im beginning law school this fall in Houston and I already have plans to get into boating and someday buy my own cruiser for saltwater fishing, entertaining 6-7 friends, and overnight trips. I dont come from money and dont have very much boat experience outside of b fishing Lake Texoma where I grew up. I want to buy my first boat by 2014 (my graduation year) but Im hoping to use my between-time to learn all I can about purchasing, navigating, and maintaining a boat. Can anyone give me some sound advice on how to make my boat dream a reality? All I need in life is a steady gig, my dog, my fishing gear, a convertible, and a trusty boat. By the way Im only 25.