I just re-painted my moped too. I did all the prep my self, I sand blasted all the metal parts down and used a paint gun to put apoxy over the bare metal. I then sanded the plastic down with 140 sand paper (i think it was). Then with the spray gun primeds the sanded apoxy and plastic parts. I then sanded the primer, and on the Frame I used a Purle Blue paint with 2 we coats and that 2 wet coats of clear coat over top. On t the gards and fenders I used a clear/base gloss black paint and did 2 wet coats of that. It looks great.
Also a Good quality spray paint would look good if you dont have connections in a body shop like me or want to waste the money. But do this coats you dont want runs.
Preping is the most important part of any good paint job and one other thing,
Wait a little longer.
Put A little more money into it.
and Brag about it.
Good Luck on that let us know how it goes