I make my own starch. I use 1 Tablespoon corn starch per cup of cool water, dash of salt, and a 1/2 cup of rubbing alcohol to a quart plastic spray bottle. Mix good and strain into a spray bottle. The alcohol keeps the starch from going bad, or you could leave it out and just keep the bottle stashed in the refrigerator until you need it. Don't forget to keep shaking the bottle as you use it.
I wash, starch, and iron all of my yardage. After ironing, I roll the fabric onto small cardboard bolts and store it in a plastic tote. Be extra careful ironing that you don't stretch or distort your fabric.