4 weeks east coast - few questions from first-timer

Hello community!

We're lucky to be able to spend 4 weeks in Australia from early Nov to early Dec. It is our first time down under. The rough idea is to fly into Brisbane, and from there make our way down to Melbourne, then fly back from there.

We're traveling with a 6 year old, so we want to go rather slow, i.e. not do full day drives. I have a few questions before I go into detail planning, would really appreciate your advice!

• Is the route doable in 4 weeks in a slow pace?
• Would you rather suggest some entirely different route for that time of year?
• Do we need to book accommodations in advance, or can we keep it open and flexible, and book spontaneously for the next night?
• We're thinking about doing a part of the trip in a camper (not all as it seems so expensive). Which section would you chose the camper for? Syd-Mel?