I want to build my first quadcopter, i have a lot of parts for esky belt cp helicopter, esky lama v4, is it possible to use transmitter and reciver? or any other parts?
It's likely you can re-use your radio, and receiver. Possibly the battery, and you might re-use any cameras or transmitters, but more likely you'll want newer better stuff available now.
As long as you have a 4ch tx/rx, you should be okay - although 6 channels or more are better. Like Hugh said - maybe the battery as well. Generally, I'd say not much else, but it depends on how creative you can get.