1. don't begin your first rag rug with a 3x5. a 2x3 is probably far more rewarding in that immediate gratification way.
2. also, just start on one side and work your way over. i didn't do that, clearly and now things are getting hairy.
3. any fabric scraps with spandex in them, or jersey works the best. plain ole cotton, denim, or corduroy are a pain in the butt.