Welcome to TE! I started riding on a hybrid,then got a roadie a few months later. I was nervy on the roadie because it was light and fast and I just started riding clipless. I had a few minor crashes that were embarassing but funny now. I just figured oh good now I've gotten that over with. When I first started out I read everything I could and pestered my DH with questions then I found TE. I think its great you are doing a duathalon. I don't know where you live but you might see if any local bike club has any beginners rides. Plus your local bike shop may have classes. Good luck!