Welcome to the quilting board from a Texas member. Hope you enjoy it here. Ask as many questions as you can think up & someone will be around soon to help you. We have a lot of talented quilters on this board who are very helpful & encouraging.
If you are wanting a "finished" 6 inch square you will have to start with a 6 1/2" square. You loose 1/4" on each side when you sew your seams together. I hope this helps you.