ya this is dave from bsh in bethlehem, pa (where are you at in pa). to ride a moped legally you need:
1. official moped title in your name (need this before you can get ANYTHING else)
if you don't have this you can get it in your name via the international title service at www.its-titles.com for $75 (done this twice now no problems)
2. moped insurance (roughly $120/year)
3. moped license plate and registration
and that's it. no helmets required by law.
dave reporting from thailand