Hi Nancy,
I like to starch the fabric before I cut it - I spray the starch on the back, let it soak in for a minute or two, then press.
I find the starched fabric behaves better when cutting, whein sewing and definitely helps keep me from stretching the pieces when pressing after sewing them together.
Especially with half-square triangles, tube quilting, etc where you've got bias edges.
You don't have to get fancy - the spray starch you find in the laundry area of the grocery store works just fine - but there are some brands that the lqs sell - it does work well, and is lightly frangranced too (you may or may not want that). Or do a search on the board for recipes to make your own.