It is a good idea to get some instruction from the guy at inverness. Also have a look at CAP413 supplement 3 as well. In addition to emergencies look up the VDF procedure for requesting a QDM, QDR or QTE. The main thing with RT is to be safe and to communicate. have a look at
www.flyontrack.co.uk there is a useful aid there for the basic transmissions. if you select Airspace and Safety initiatives at the bottom then Downloads there is an RT kneeboard version that may help you.