Big93, it seems like you have a lot of projects on the boil and I think that interfacing with radio control is one of the more complex things you could do. It may be easer for you to get some experience with some simpler interfacing tasks first.
But, if you really want to tackle the task, you need to find out if your transmitter has a 'trainer' or 'buddy' port. If you can't find a model number or a web site with an image of your transmitter, can you take a picture with a digital camera and post it here.