To me I always thought garage sale was for thing you no longer wont. Now if you are looking to make more money for is do not put it in a garage like I seen here. If it are stuff you do not wont to part with put it and a storage.
But you are look for what will sale. I would look for ever thing, I only been quilting for about 2 yrs . I us ever thing. A friend gave me a small box of scraps from a quilting class she gos to. It took me all most 2 weeks to go throw it all. but I am making a quilt out of it.
So do not think any thing is just junk but it in a bag put a $1 OR .50 some one may love to have it.