hello i'd like to know what materials i need to build a CHEAP a real cheap one (sorry not too much money to spend on it rite now) and help to build it thank you very much

Hi Pocket Kun,
I might suggest buying a trainer kit, which comes with instructions, but if you are starting out with nothing i.e. servos, tx, rx etc. I would buy a full kit with all you need, however, you should expect to pay around $300- $500. I would recomend, if you do not have a big bugget, getting an electric trainer if you are not familiar with gas engines.
If you are new to flying, I would recomend you get an instructor or a simmulator, like Realflight, to help you out. Even though a trainer plane might look cool, if this is your first plane, I would recomend getting a powered wing to help you learn the controls and basics of flight, plus, they are almos indestrcutable, and frienly to frist-timers.
I remember when I was in your situation, I did not have a lot of money to put into it, and I went for the cheap tx and stuff like that, but i learned that when I upgraded, I needed a whole new transmitter. I would advise buying one high quality transmitter, around 6 channels, so it is cheaper to upgrade.

-g

gcac399 is right about the electric trainer , your can start by buying the GWS Slow Stick (See photos and videos on the gallery) for around US$34, the kit is ARF and comes with electric Motor, it allows to put standard servos and receiver on it so you can use almost every radio gear around.

The plane is an excelent trainer and you will not regret the purchase.

Remember that you will need the radio gear, if you don't have any you can also start with cheap GWS equipment, that's it Trasmitter, receiver, cristals, servos, and battery for around US$120

You can visit GWS Home page for more information.