Unfortunately, the only way to learn RTF procedures properly is a combination of having it taught to you on an R/T course and listening and taking note of what goes on at an airfield with an official Air Traffic Control Unit.
Once you've had a few hours on the practical side of using the radio, try and arrange a visit to the ATC Unit at a local airport, most places are pretty accomodating and will do their best to fit you in.
Forget anything less than an airport with an ATC service, with due respect, although certain standards are supposed to be maintained, they very rarely are at airfields which don't have an authorised ATC service.
Precise and accurate RTF is essential for all sorts of reasons, not least safety, but it isn't easy to learn and the majority of us ATCOs will go out of our way to help you.
Just remember, if you don't understand, ask and if necessary, ask again.
