Start your wrap, as snuggly as you can, I like wrapping with my fingers.
When you come to the end of the coil, use chain-nose pliers or a pair of parallel-jaw pliers (these work best) to crimp down your coil. With the balled ends, you can tuck them tight to the coil or bend them up over the coil for a design element. Have fun with it, the possibilities are endless.
Thank you and have a great day creating!