You really don't NEED a stash, EVER. I started my beginning quilters with three yards of fabric, one each of coordinating dark, medium and light. They had the choice of Rail Fence or Disappearing 9-Patch. We made some really cute quilts. For now, buy only what you need for one quilt, then buy only what you need for the next. Your leftovers are either scraps or stash, depending how you look at them (and how big they are).