When using the Tower/CTAF Frequencies, use the 5 W's.
Who you are contacting
Who you are
Where you are
What you want
Who you are
For example:
"Rockford Center, N1234 5 miles south of the island, requesting transition through the bravo, N1234."
You: "Tower, Callsign, VFR to Destination"
Tower: "Callsign, Cleared VFR to Destination, Expect runway RNWY, Flight level 015 after departure, departure is with me, squawk 1200"
You: "Cleared VFR to Destination, Expect runway RNWY, climb 015 after departure, departure is with you, squawk 1200 for Callsign"