I have made many quilts using the international stitch. I usually mark my quilts about 3-4 inches apart. It is really helpful if you use what is known as a "doll needle." It is about 3-4 inches long, has a large eye and makes tying the quilt so much easier. I found that using crochet cotton (doubled) works really well. The YouTube that was suggested previously will help you, and if you want more information just Google "International Stitch". Be sure to include the quote marks on your search keywords.