I would use the 433Mhz radios you intend to use (you did not say which ones) and use some sample code to sent simple messages like "Hello World" between transmitter and receiver.
Once you have that code done you can move onto working out how to read a GPS, then how to send and receive the co-ordinates via 433Mhz radios.
You should read your first post back to yourself, do you really think there is enough information there to describe your project ?
You may know the details of your project is, we do not.