Yes, Copyright it!
Once your pattern(s) is correct, easy to follow, clear and concise instructions and illustrations ....make sure that your pattern cover looks professional. Nothing turns a shop off is a sub par unattractive pattern cover. Examples of top notch pattern covers are by Lazy Girl, Mountain Peek, shabby Fabrics, etc. Visit your quilt shops and you will see this demonstrated. The first visual impression is key. It has to capture attention. Looks do matter.
You have to market the heck out of your pattern! Facebook, Etsy, word of mouth, visit Guilds, quilt shows, etc.etc. I would make a few samples out of the pattern and visit local quilt shops. Perhaps offer to loan the shop a sample with an opening order of 6 patterns or more. Shops love to have "exclusive" products to offer their customers. Do you teach classes?
You have a lot of marketing and leg work to launch a pattern. It is up to you to market and promote your product.
Best of luck!
sandy