how big are you? i promise, a pocket bike/ pit bike is NOT the way to learn if you want to ride big bikes.

if your under 200lbs/6'2 id recommend a 125 2 stroke. its a smaller bike, with decent power, and should be easier on you. some might argue that its too small, but since your new to riding, i think with proper judgement, you should be fine. your little brother on the other hand? im not so sure.