Hello, and welcome from MI!
Rummage sales are my friend. I buy box loads of fabric from them. It's usually less than $1 per yard, and you can build quite a stash that way. I wash all fabrics imediately, and iron them. one reason: If it's a cotton blend it will melt under the iron and it goes into the fabric for clothing bin. I have a bin each for lights, mediums and darks, and one for pieces less than 1 yard.
If you don't do this, it will quicky get outa hand, and you'll have a mess.