Below are some links to different sites, including mine, that have directions for different edging treatments. I hope you find them helpful.
Shell Crocheted Edge
Note:
A beginners crochet book can be helpful. There are lots of good ones out there. You should be able to find one at your local craft store. Leisure Arts and some other companies make some good crochet edging books too. Look for those while you are at the craft store.