Do i need a license to operate a motor scooter or mopehead at 50cc in florida?

I think you may not, unless the laws have recently changed. I heard that many folks who have had their licenses revoked due to DUIs get scooters so that they may still be mobile. But I haven't heard if that ha changed. Check with the Florida DMV. Their website says:

"You must have one of the following if you are going to operate a two or three wheel motorcycle that has an engine over 50 cc.
Motorcycle Endorsement

If you already have a Florida drivers license then you can get a motorcycle endorsement on the drivers license you hold. To obtain your motorcycle endorsement you must show proof that you have completed a motorcycle safety course at the drivers license office. If you are over 21 you may select to forgo the motorcycle driving course if you take and pass the motorcycle knowledge and skills test at a Florida drivers license office.

Motorcycle Only License

To get a Motorcycle Only license you must be at least 16 years old and have held a learners permit for at least a year with no traffic convictions. If you are over 18 you are not required to have held a learners permit. You must pass the standard class E operators license test that all drivers take to get a drivers license."

Which one may deduce that for 49c and under you do not need it.

Yes. You need one for any motorized vehicle.

motor vehicle: Any self-propelled vehicle, including a motor vehicle combination, not operated upon rails or guideway, excluding vehicles moved solely by human power, motorized wheelchairs, and motorized bicycles as defined in Section 316.003, Florida Statutes.
motorized scooter: Any vehicle not having a seat or saddle for the use of the rider, designed to travel on not more than three wheels, and not capable of propelling the vehicle at a speed greater 30 miles per hour on level ground.

Street legal motor scooters require a license.