I starch all my fabrics before I cut into them. I use a dishpan using Sta-Flo liquid starch and water. I soak each piece starting with the lightest fabric that might not bleed and end with those I think will bleed in case I have to change the starch mixture. I picked up the top section of an old wringer washer and I put that between the 2 sinks so the excess can drain back into the dishpan and the wroung out fabric will go into the other sink. Then I hang them up to dry. Once dried, I mist them using a mixture of vinegar and water as vinegar is supposedly another source to set colors. I installed a 24 x 48" piece of plywood over my ironing board, covered it in batting and that silver heat resistance fabric and press away. By using the wringer gadget, I end up with less wrinkles than if I wroung it out by hand. So far this has worked for me for the past 5-6 years.
When I heard Sta-Flo was going off the market, I went around to all my grocery stores and bought every bottle I could find. You can order it online but it's now at triple the price we used to pay for it.
I used to add Vodka to my starch mixture but you really need to find the Vodka made from potatoes as they have starch in them but it's hard to find or at least I haven't been able to find it.
If you use hot or warm water to your starch mixture, if the fabric is going to bleed or shrink, it should happen then. But I always give a little packet with a couple color catchers with instructions on how to use it with every quilt I gift out in case it wants to bleed again when washed the first couple times.