Kid, you always have somebody else do your homework?
Rocket motors, size G and under, do not require a license. As for rocket size.. From the Model Rocket Saftey Code, on the website above:
7. Size. My model rocket will not weigh more than 1,500 grams (53 ounces) at liftoff and will not contain more than 125 grams (4.4 ounces) of propellant or 320 N-sec (71.9 pound-seconds) of total impulse. If my model rocket weighs more than one pound (453 grams) at liftoff or has more than four ounces (113 grams) of propellant, I will check and comply with Federal Aviation Administration regulations before flying.
Now before you get your testicles in an uproar, I strongly suggest you stick your nose into the publications on that website, including the saftey code, in it's entirety, and do yer damn homework. There are restrictions regarding launch area conditions.. size of open field as well as other saftey requirements.
Read, kid. Does a brain good.
