Riding in the dirt is not like riding on the tarmac and it is also a hell of a lot safer thasn riding on the street.

Anyways, i always recommend the power ranger look and to take the Georgia class. It shows you things you might encounter at the worst moments. Also, modern 600s are just as fast as the 2000 era superbikes. It is best to learn all the riding skills necessary for you to become comfortable with the machine.

Sporty: Kawi Ninja 250
Bit more everyday: Suzuki SV650