Replying to Jobs in Photography / Advise

I want to do something in photography in the future so I was wondering if any of you have any advise on things I can do to start taking my photography seriously. Im thinking about joining yearbook because that would be good practice for taking photos in different situations. I also am going to start taking senior pictures for my friends. Do any of you have advise on college classes I should take in the future or things I could do now to help me out in the future.