Hey ben, I was in the same position as you a couple years ago. There's really two ways you can go- (1) get a job in the fishing industry and have plenty of hookups and be around the industry or (2) get a job which allows you to make enough money to buy all your fishing goodies, fish once in awhile and retire as soon as possible so you can fish more. It's up to you, just depends on which way you wanna take it.

Just like anything, if you want to have a career in fishing you need to start at the bottom and work your way up. Now's the time to start scrubbing decks if you wanna be a sportboat captain, or learning to wrap rods if you wanna be a rod builder, etc. Working at a tackle shop is a good start if nothing else. Unless you're interested in the fisheries or biology side of things it's tough to find a concentration once you get to school that'll help you out in the fishing industry. Most fishing careers are better prepared for with time on the water rather than time in the books.
-Brian