before you consider racing, as stu has said, have a few track days, and if you find paying for them easy get saving, on average its around £400 per race, and then there is the tyres, maintenance, van, kit, fuel, practice, hotel/camping. buying a bike in the first place, the trick bits, liquids. your not to old, but i would look into a bigger class of bike, maybe 400 or 600. that way if you are good enough and go for a proper racing career you will win a little lol but you could go out to impress other teams and maybe if you can prove your worth people will start to sponsor you