dont listen to anybody who says "why u thinking about getting such a small bike". i have a 300 and 600cc track bikes in an r3 and a zx-6r and i lap people on my 'little' 300. On an R3, you'll develop a skill set and get everything out of the bike. I would also recommend, if you're responsible enough, to start on a middle weight upright like fz-07 (which i did) , ktm 790 duke or a Z650. These bikes are immensely fun because you can wheelie the hell out of them, upkeep like oil changes are much easier than a bike with fairings.
PLEASE READ THIS
BEFORE YOU BUY A MOTORCYCLE: BUY ALL OF THE GEAR
HELMET(ARAI,SHOEI,AGV)
JACKET AND PANTS (ICON/ DAINESE)
BOOTS
GLOVES
ive been hit twice already, surgeries and flipping over cars is the name of them game, you just gotta be prepared to go down
dress for the slide, not the ride