Re: ON MY FIRST BUILD From Pearland , Tx
You're 16, 225 lbs. You want that powerful motor for a lot of acceleration. The easiest method would be rack-mount friction-drive.
The ebay ad for the motor said "performance clutch". Is that centrifugal or cable operated? Are you planning to keep and use the pull start, or will you be bump starting?
Doing a friction drive means there is no need for jackshaft gear reduction, chains and/or belts and pulleys and/or sprockets. No need for extra strong rear wheel.
Even if you don't want friction drive, a rack mount would make it SO much easier to mount and align the parts you'll need.
Of course, you probably need that motor in-frame because it will looks so cool, like a motorcycle. And there will be something to fix about every five rides.