Quick grow up

I am very very new in this game and i am a little bit confused. So what you believe is the best way for someone to grow up as fast as it possible?

Buying a cheap new car and participating in many races without care about positions?
Buying an expensive and powerfull car and trying to win?
Or something else.......?
As i saw, some things are new in S4 and i think there are some new cars. Have you any suggestion about what of them is better? ( beside of devotions like Emily's Corvettes )

I think you need to enter as many races as you can, I think it will get you a lot of money and it's good experience for your drivers. I think maybe go for a cheaper car but not too cheap if you know what I mean. Don't buy a car that's lvl 0-5, it's not worth it. But I would buy a new car as I said Down the Pub.
I'm not sure what the best cars are at the moment, there are so many that are good.

Ems