[lextrueno]

Another point that I don't think many have addressed yet is if you live in an area where weather limits track time, it is a good idea to invest into a entry level sim rig. You can get a lot of seat time playing gran turismo or iRacing just by using a decent seat and force feedback wheel. I know this isn't the perfect way to learn/gather data. But I think for the money you can develop your race craft in a fun, safe learning environment with no extra costs for consumables like brakes and tires. Also some coaches can work with you through those games to analyze your line and help you focus on certain aspects of your racing.

Assuming you have nothing:
Racing Seat with mounts for wheel/pedals - $230-$500 dollars
Thrustmaster T300 Ferrari - $400
PS4 with Gran Turismo -$330 (Black Friday sales would be a good time to pick one up)