I'ved moved so often that i have a system down pat..lol
Start in one room, pack what you are taking, sort out what you are donating or throwing out.
Pack everything into the middle of the room so that you can still clean the walls, window tracks, etc.
Once that is done, shut the door and move on to the next room.
If you follow that system, once it's time to move everything out, you are only left to give the floors a vacuum and a professional clean and possibly a quick spot clean of anything you have missed.
As for packing toys, if you have any stuffed ones you can pack them directly into any cupboards/ drawers that you are taking. This saves space by needing less boxes and doesn't really add to the weight.
If you are after free boxes you can get some from bunnings out the front or if you go to kmart whilst they are filling the shelves you can pick up some decent sized ones.