you're not going to learn anything on anything labled a "pocket bike" escept how to be obnoxious to other drivers. They are primarily made in china and korea in the worst quality imaginable.
They are not the same size as a motorcycle, they are not geared or controlled like a motorcycle.
There is nothing you can learn from a pocket bike that applies to a real motorcycle that you can't learn from a mountain bike.
If you're serious about learning, buy a bigger scooter, or just a small motorcycle. Do everyone a favor and don't be "that guy" that has a tries to ride a pocket bike.