new to triathalon

Hi everyone,
I'm just getting started training for tri's next year. I'm starting from scratch in the water,
although I've always felt comfortable swimming. I plan on joining the master swim program at the local Y. Most likely I will continue riding my old mountain bike for training untill I can buy a tri bike or road bike. I have been running for a few years, did a marathon in 2003, but have been slacking off since then. I'm really excited about training and racing in future tri's