It kind of depends on what kind of Bow Tie blocks you want. There is the oldfashioned block that is put together with Y seams. There is a newer one done by sewing 4 triangles to the 4 squares before sewing them together. There is also the Faux Bow Tie or 10 minute block way of doing the block. Which one are you going to do? If it's the old one, I would start by drawing 4, 5inch blocks on a piece of feezer paper. I would then decide how big I wanted the center square to be (measure one of the original squares) After it was drawn out I would cut and separate all the paper pieces. If you used the freezer paper, the pieces could be ironed onto your fabric as templates and you could add the 1/4 seam allowances around all the pieces and cut out. You could remove the freezer paper templates before sewing it together and the templates could be used several times before wearing out.