Here's what you will need-
6 channel computer radio for $200. The Airtronics RD6000 is my favorite.
A trainer which will run about $110. The Sig Kadet LT-40 is the best trainer you will find. The Hobbico Superstar, Avistar, and the Goldberg Eagle 2 are also decent.
An engine which will run about $80. The Thunder Tiger Pro .46 is my favorite.
That's the whole airplane setup. AS far as field equipment goes-
You need a glow igniter to start the engine. That's $15...
You need a fuel pump to pump the fuel. That's $10...
You will need some glue to assemble the airplane, which will run about $15.
You will need tools like allen wrenches, screw drivers, and an exacto. I'll assume you've got that stuff. If not, just add on about $20 for all the tools you could ever need.
You will need a gallon of fuel to start which is $15.
You will need a couple Master Airscrew 11x5 props for that engine, let's say that's $5
Then you will need a good glow plug for the engine which will be about $5 for an O.S. #8.
I come up with $475 total...That's for an engine, radio, and equipment that is compatible with hundreds of possible airplanes to move on to after your trainer. Sorry all that stuff is out of order...
The next step is finding the local flying field, getting your AMA insurance (
http://www.modelaircraft.org ) and finding an instructor to get his advice. Of course, once you get an airplane you will need to get an instructor to teach you how to fly.
Welcome to RC Universe and the best hobby in the world...