start with a 125cc
Don't get a fast bike if you have no experience, or this is what will (probably) happen:
Honda shadows are actually great bikes to learn on:
http://www.google.com/images?um=1&hl...oq=&gs_rf ai=
this is what i want next:
get used to the road, the danger comes mostly from other people ( driving cars)
i would give it 6 month then get a bigger one
Good luck