hey buff, Im in the same boat as you, have just picked up my Gene from its previous owner (thanks again Michelle!) and wondering where/how to start.
To be honest, I dont know how you can contain yourself! My girlfriend is lucky I even said hello to her when I walked in the door as all I wanted to do was fire up the Gene and start roasting. I can appreciate the desire to start getting it right for any given bean right from the get go, but remember that we all have different palates, and a roast profile that works for one person may not appeal to another.
There is plenty of resources around, this website, the Avacuppa Wiki and many others. I say measure out 250g beans and get cracking! IMHO there is something very mesmerising about watching the beans go around and around inside the drum and very, very exciting about roasting your own coffee and learning what works for you.
Good luck! *:) :)