-To allow more distance between you and the car? I have it so that I can control the car from my computer. I would like to make it so that the car can be outside, while I am controlling it inside, using a mounted camera to guide it. Can this be done easily?

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Generally no, the FCC has very strict requirements for radio frequencies and they usually do not allow people to boost specific signals due to interference. You might try looking up a few hobby sites to see if they sell boosted antennas to see if that

is it possible to build a rc remote control car from a toy car say i brought a toy car and then got a electric rc motor or something would it be possible to then create a rc car if so how and where could i get the motor and things i need?

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You can but make sure that the car's steering can be turned left and right or that it even has a steering system however basic as it may seem. Next, you would need a speed controller, 1 servo for steering, a receiver and 1 transmitter. Thatis if that

I bought a RC car/truck which says 49mhz. having no experience with rc cars at all, i think it does a little surge forward too violently and moves too fast. Now the store wouldnt allow me to return or exchange for another car, and i dont want to go through

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Add a 50K potentiometer in series with the speed control and the motor. This way you can slow or speed up the signal processing i.e. slow it down by turning a dial. Radio shack has these for under $7 and you need a soldering iron and solder.
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