During this week, figure out things that you might want to keep and bring to your new place, segregate things and separate those that are still usable but you don't want to keep, because it might still be usable for other people, these are the stuff that you can sell in your garage. For stuff that you might consider scraps, you can throw it in the garbage or you can bring it to the recycling facilities to be recycled.
Why do you need to do these? because it can slow down when you start packing, and will cost you more paying for the movers. So why don't you start deciding which one should stay or should go!