Re: thinking about buying a sports bike
I would say first take the MSF course. I used to demo ride for students as an instructor. Once you get safely through the MSF course, the next step will be logical. Either you will buy a first bike or you will know to stick with cars.
After the MSF, if you still want to ride, a used Suzuki SV650 or SV650S would be a good place to start. Small enough to learn the basics, but big enough to be fun for a while. Buy used and it will probably hold your money together.
New riders/buyers generally make one or more of three mistakes. 1. Buying new for a first bike. (They will fall over when left to their own devices.) 2. Buying too big for a first bike. (New riders should not be on liter bikes.) or, 3. Buying too small for a first bike. Sure a Ninja 250 is fun, but after six months, at your size, you will wish you had gone bigger.
I have owned over 20 bikes. I raced amatuer motocross and hare scrambles for ten years. I worked as a parts man, service tech, salesman, and finally a general manager at both independent shops and franchised motorcycle dealers from 1996-2009.
If you decide to go ahead with this, and have any specific questions, feel free to send me a pm.