Beginner to Triathlon training

Hi There,

I made a decision to try a tri this year. I've been running most of my life, but not on a regular basis in years. For that reason I'm going to consider myself a "Couch to Tri" kinda person. I just got my bike out for the first time today to cycle to the gym and I have to admit, I'm a little afraid of it. I've only had mountain bikes up to this point in time and riding in traffic on such skinny wheels is a little intimidating.

I thought joining a forum might help motivate me and help find some advice from people who know what they're doing!