RAAF fighter squadrons nominally have 18x jets assigned to them. 6 Squadron is the exception to this rule at present, having only 6x jets on-board.
If the Super Hornet purchase goes ahead, the Super Hornet squadrons will most likely have a nominal strength of 16x jets per squadron with 1, 6 and probably 75 Squadron taking on the Supers and Growlers.
6 Squadron are pegged to run all the Growlers. It isn't clear yet (because no decision has been made) as to whether the 12x Growlers in the DSCA request will replace the conversion of the pre-wired F/A-18F's, but it is certain we won't be running 24x Growlers.
If the decision goes ahead it's likely that 1 and 75 Squadron at Tindal will run 16x F/A-18F's a piece and 6 squadron will run 4x F/A-18F's and 12x EA-18G to provide an OCU capability and EW capability for RAAF.
In practice the jets are allocated to squadrons as needed, as they're only parked 100 metres away from each other at Amberley, but that will be the nominal allocation again, if it goes ahead.
The F/A-18A/B's will then consolidate at Williamstown with a reduced fleet maintained from the best of the remaining Hornets (in FLEI terms) until they can be replaced by F-35 in years to come.