My first priority would be what I want in my new sewing area. This is your chance to make your spot nice for you there. The next would be family heirlooms and photos that have to come on the move.
Start weeding to the thrift store, going with you and garbage. Decide on what pieces of furniture are going with you. If your family wants things that don't have tags on them to go to the new place, have them come and pick up what they want. Look into a storage unit if you end up with a few things you still want but have no room for. Pay for a year to store them and reassess at the end of the year to sell or keep.