I have my fabric folded on shelves inside the closet and dust isn't an issue. Pieces 1 yard and up I wrap on the cardboard comic book boards. Pieces over 1/4 yard I ruler fold. FQs and scraps I have in clear plastic bins.
To fold, I lay the fabric out as it's folded on the bolt. Fold in half again so the fold and selvedges meet, wrap on the board (or ruler fold). I use a 4" ruler on the smaller pieces. You don't NEED the boards, you could just ruler fold all of it. I'd use a larger ruler for larger pieces. Maybe a 6-8" or so.