What car
I would go with a mid-size Chevy as it is the easiest and cheapest to build and race. Preferably with a small block. After you run the car awhile you can add a big block and pick it up some more. My reasoning is that too much car too soon is dangerous for you and your fellow racers. You can run 10's with a SBC but, nothing wrong with starting slower to learn how to drive it. It's alot easier to control a car that gets loose that runs 12's than to try and learn how to save it in a 9 second car. There is no replacement for experience. Just my opinion.