OK blively welcome to the quadrino family
have you downloaded audrino sketch? this is where you are goin to define tricopter in the sketch. instead of typing all of the instructions, i used this tutorial right here and just follow closely and itll get you there. When you are in sketch, make sure you define one of something in each section to fit your tri-setup.
Pm me and i can give you my number and give me a call when you need help. I called Doc and he was a great mentor. I could help out.