ORIGINAL: rjm1982
Jet-A is not very expensive and does not require a licence...its called kerosene on the pubic market...its pretty much the same stuff...jet-a is just a little more pure, but not enough to warrent using it....
the fuel doesn't, but yes, to fly it with any AMA coverage requires you to be checked out and certified on a high performance prop plane. (my converted weedie engine runs on basically jet fuel. kerosene with a little oil and some octane boost thrown in for good measure)
anyway, to the original poster, take the good advice given. don't plane on going to a jet without a couple years experience, and at least $10,000 into the hobby. (counting previous planes and the jet) I would HIGHLY suggest getting some trainer stick time on a high speed prop plane as early as possible, you may find out fast planes aren't nearly as much fun as you would think. (screaming by one way, turn around, rinse and repeat until you are out of gas... I fly an overpowered shrike .40 so I know how that goes!)