No, you must have a license to ride a motorcycle on a public street or road.
Do you gotta have a regular driver's license that I have a motorcycle license,
It is illegal to ride a motorcycle without a license. You must have a valid motorcycle license to legally practice riding a motorcycle.
No, It is not illegal from someone that does not have a license to ride the motorcycle. If the person without a license was driving the motorcycle then it would be illegal.
You can't ride a motorcycle on the sidewalk because you would be dangerous to pedestrians.
It is illegal to ride a motorcycle without a license. To practice riding, you should first obtain a learner's permit or take a motorcycle safety course.
Please check the Motorcycle Manual (related link).
Yes, you just can't ride it
49cc. 49cc. 49cc. 49cc.
No. Get your license. Once you have your motorcycle license you can ride your motorcycle in any state in the union with a license from any other state. Do not try to do it on a learner's permit.
you would need a m-class endorsement to ride a motorcycle
This varies from place to place. In some places, there is a specific motorcycle learner's license that you need to have before riding a motorcycle. In some places, you can ride a motorcycle with a normal driver's license. In other places, no license is required.
You do not need a motorcycle license to ride a 49cc and smaller bike in Utah. But I believe 50+cc, you do need a license. Double check with the dealership.