You need at a minimum 6 repeats of your fabric. That is repeats along the selvage edge not across the width.
You will also need your:
6 in X 12 in ruler with a 60 degree line on it.
flat flowerhead pins
neutral thread that blends with your fabric
If you are doing the stack n whack star you will also need fabric for your star points approximately 1 - 1.5 yards (something that contrasts and stands out strongly against your hexagon fabric preferably a solid or tone on tone) If you want to use it as a wider outside border you might want to have 2 to 2.5 depending on how large you make your quilt.
You will also need background fabric. This could be left until after all the blocks are made. It is sometimes surprising what looks the best and you might want to try out several backgrounds after the hexagons are made. I did not expect the green to be the background but it showed off the stars the best.
If you are doing the one block wonder you will also need fat quarters of three or more colors (dark, medium and light of each color) for the hollow cubes/tumbling blocks. See picture of Jackie's quilt below for example.
Looking forward to a great time. Please be aware because of the UFO day on the Saturday between we may have to move our machines to make room for those coming to sew for the Saturday.