I would strip piece the blocks. You may not know how to do this, but it saves a lot of time. Cut 6.5" strips of the dark and 3.5" of the white. Sew them together, then cut with a rotary cutter into 6.5" pieces. Cut 3.5" strips of the light fabric and 6.5" strips of the white. Sew together, then cut into 3.5" pieces. Then you would sew these two sections together. Just have to keep up with how many of each color you need. Welcome to the Quilting World!!