theobeast, it can get expensive if you want to drive all the cars.
stick with a class that you like and just drive the one or two cars for a couple of seasons.
The cars that come with your iracing subscription should present you with some fun until you can afford another car.
Iracing is a web based service that lets you race with other humans... no AI.
Iracing costs a monthly fee then you need a racing wheel and pedals (about 200.00)
I'm pretty sure they have about 4 seasons a year.
You can learn more at www.iracing.com