How do i patent and start selling something i created?

i created a remote Control car, The big companies that sell remote Control cars are Tamiya, team losi, team ociated, Integy etc. I have created a car similar to what they create. its competition category and very fast and durable, not like a toy car from New Bright or a Company like that. Its a car like the race in the competitions that can go about 50-60MPH and cost about 700 dollars. First i want to patent it so no one can copy my design exactly. how do i patent it?? then i want to start small like duplicating it and selling it on ebay. first build cost me 2000 dollars from start to finnish with trial and error, next builds will cost less than 200 dollars from start to finnish so im sure i will make a profit from selling it for 235. the parts i used are mostly from Home Depot hardware store. some parts and electronics are from these different companies: Traxxas, Futaba, Team losi. Will that be a problem in patenting my design because it has other company parts??? Don't read this if your not very interested in hobby RC racing. ( The design is like no other RC car out there. the engine is in the front of the car its a TRAXXAS E-MAXX motor and embly, the shape of that motor resembles the shape of en engine, the transmission has a drive shaft that links back to the rear axle differential, the rear axle is taken from a WHEELY KING truck. The shocks are from a TRAXXAS RUSTLER. the body is a 1/6th scale monte carlo racing. The car itself is a 1/6th scale car. The wheels are from a TRAXXAS RUSTLER. the hood of the car body opens for the engine compartment. The car body does not need to be taken off to replace or remove parts in most cases because most of the electronics and parts are in the engine compartment open the hood. The cab of the car is empty you can put in seats if you want. the dashboard and floor of the car is made from aluminum joist panning. 95% of the car is metal, the frame is made from 1/4 rectangular steel rods. basically go look at the design of a real rear wheel drive car and imagine it 1/6th the size... it sounds kind of dumb but if you could see a picture of it i wouldn't be surprised if you were willing to pay 400+ for it... its about 75% completed. completion date is projected to be mid july 2010.