When at a controlled airport ( towered ) the radio procedure I use is to first taxi up to the hold short line and call tower. " Martin Tower, Cessna 12345 ready for departure runway 33 full length." You are telling the tower you are ready to take-off and you are using the full length of the runway. If you are departing using an intersection, you are required to tell ground before taxiing and tell tower when you are ready to go.
" Martin Ground, Cessna 12345 request intersection charlie departure." Cessna 345 Martin Ground, taxi runway 33 intersection charlie approved."