Welcome Edwina
How lucky you are to have some of the old flour sacks. I am 65 and I remember well wearing dresses and matching bloomers to school made out of those flour sacks. I remember one pair of bloomers that you could read the name of the flour on them I think it was Aunt Jamima. You should be able to come up with some simple strip quilting or squares mixed with triangles, etc. I guarantee you that if anyone can tell you these ladies on this site can.
You will learn a lot and have lots of fun reading the postings and looking at the pictures.
Good luck, Jane Sisk