Test the waters by hosting a house party and selling your jewelry there. If you're pleased with the response (which I bet you will be), sign up for a table at an office craft fair or church bazaar. If that goes well, register for a booth at your local bead society's show. Up next is your town's craft fair. THEN book a booth at a national trade show. From there, the sky's the limit. Good luck!
A great tool to help you, right from the beginning, is Jewelry Designer Manager Pro™. This is software that not only helps you price your finished designs, it also helps keep track of inventory, customers and many other functions that you'll be glad to have help with.
When thinking about shows, be sure to check Fire Mountain Gems and Beads Events Directory for information on shows near you.