I use the comic boards that I buy from Amazon and secure the fabric with jumbo size vinyl-coated paper clips. I used to use pins but worried about rust in the humid climate where I live. The comic boards are kind of flimsy, as auntpiggylpn mentions, but I only use them for amounts under two yards. Anything larger, I fold on a ruler and stack on a shelf.
Good luck with your organizing...you'll be so glad you did it!