Stay on the Coota CTAF until departed, then make an Area call with climbing details. If you're not already known-about by inbound IFR monitoring your CTAF calls, they'll pick you up on your Area call.
Goulburn: CBR approach is a red herring. CTA is above 8500ft! Area freq boundary? Which way are you going? Call on the Area freq for the airspace you are going into.
All done on one radio. Or are you taking the p155?