First, welcome to the forums.
Second, there is a lot of information here, and the search function can, and will, do you and a lot of the members here a lot of good.
That said, there are isn't going to be a lot of digging for you to do, to be honest.
You mentioned racing--by that, I'm assuming you mean organized racing on at least a temporary parking lot track with timing and regulations per class. Instead of focusing on a specific RTR car, go to your local track, look at all the different classes that run, decide which class you wish to start in that is appropriate for your skill level and budget/time constraints, and then decide if a car in that particular class is available in RTR form.
Aside from the "catch-all" entry level classes (if you're lucky to have one at your track), you will need to learn to work on your car. At the very least, you will need to be able to change speed controllers, motors, and gearing to race in a specified class, whatever that may be.
I would not discourage you at all from participating in racing, but just because it is with "small toy cars" does not mean that it is no less technical than their full-scale equivalent--even at the club level, there is a lot of tweaking and maintenance to go around.
You can find me at the folllowing sites:
twowheel at rcracing.com
FuriousFlip at ultimaterc.com
K.O.M. at rccrawler.com
TW@ at vwvortex.com