What do i need to know about sports motorcycles before i buy one

Learn how to ride.

Its great that you're doing research now.

Take a motorcycle safety foundation class if u have not already. Get the proper safety equipment, gloves, boots & helmet to start with.

Be aware that most motorcycle accidents come in the first 6 months of riding a motorcycle. And be aware that if u or someone near you, makes a mistake, it can end up serious (and yes, I've been to a funeral for a 18 year old beginning rider).

If you're looking for a used bike, then u might visit the local library & see if they carry old editions of some of the cycle magazines.

Good websites to look at bike that r currently for sale r cycletrader & craigslist.org.

It would probably be a good idea to start off with a smaller cruiser or dual sport, a lot of people get into accidents & lose their bikes or worse when their first bike is a sport bike, but if u r interested a few sites for information more on maintenance r here.. they r really useful to know because u have to take better care of a motorcycle than u do a car.. more oil changes, lubing the chain, & they r a bit more prone to problems..
cyclemaintenance.com/misc/buying.htm
Buying a motorcycle - Cyclemaintenance.com
canyonchasers.net/shop/
visi.com/~dalebor/maint.htm
I am new so please take my advice with a grain of salt, & those r probably not the best sites out their either but they're what I found when I was looking

It appears you may need to learn to ride a streetbike. A sportsbike is not the best bike to learn how to ride on. You should sign up to take a riding class first, and some of those classes have bikes for you to learn on.

First of all insurance on sports bikes is usually high, at least in Michigan.Kawasaki makes a good sports bike.You might want to check out auto trader.