There is few of us that did triathlon here and there. For the training it all depends on what you your expectations are and how much time you want to commit. Now is the good time to start getting ready. Work on your weakest part of the three disciplines the most and go from there. From the specific training programs, you can find a lot online, some are free, some you have to pay for. Just so you know, triathlon workouts are demanding and time consuming.