The reason you wont find any tutorials on how to build simple data transmitters and receivers is simply because you cant.
Data receivers that will do what you want are not simple.
You need a full super heterodyne receiver which requires RF stage , Mixer , IF amplifier , Detector ,Data slicer , AGC control, Crystal Synthesised local oscillator and antenna .
You also need specialised test gear including a signal generator and a frequency counter or spectrum analyser.
Unless you have a very strong background in Radio Comm design then forget building the radio part of your project and buy
readily available radios.