1. not sure about accom
2. Bells is not very close by. Bells/Torquay is kind of below Geelong, so to get there from Phillip Island you have to drive all the way around port phillip, or get the ferry from sorrento (mornington peninsula) accross to queenscliff.
3. no idea sorry
4. whilst its almost summer... it can still get pretty cold that far down south - its pretty much the most southerly point on the aussie mainland. so pack for all seasons - you will most likely get rain, heat, cold and fog/mist all in the one day
hope this all helps! have fun