It takes years of practice to successfully learn how to maneuver a sport bike and no matter how well you do on the driving test it is not the same as being in traffic.
It is best to learn to ride on a small bike and then move up to a larger bike as you gain experience.
A smaller bike, with less power, is easier to handle.
Choose one that is not heavy so in the event that you lay it down you will be able to pick it back up.
When deciding what type of sport bike to get try several of them out.
Choose one that feels right when you sit on it and that allows both sides of your feet to be flat on the ground.
Do not choose a bike that has been modified as your first bike.
If you choose a used sports bike to learn on, check the mileage to see that it is low. Remember, you can always sell your first bike after a couple of years of driving it and get a newer, larger model.
Smaller bikes are often easier to sell then larger ones, especially if someone is looking to learn to ride.