Go through as much as you can and sort as to what you really want to finish/keep and what you are willing to donate to a guild to finish or use. Do you have duplicate tools you can also gift or donate to a guild?
When I moved I found I had waaaay to much thread. I donated it and that felt good. Also donated things I didn't want to finish, which is why they were UFO's. Most were from learning new techniques and were only for the learning process.
Sorting fabrics is you own personal choice. I prefer to keep batiks separate and then work from there. I can tell how much fabric I have in each piece by the way I folded the piece.