There are some really great sites out there filled with valuable information for 1st time authors considering doing book signings. After all you just don't show up with a few books in hand and go for it. It's important to show up prepared and to also put on a great book signing event so that the bookstore will be pleased. Professionalism is very important, while also providing the bookstores customers with a exciting and fun experience.
Here is a site with a great article on preparing for A Book Signing Event and here's another site that offers some great information 40 Ways To Make Your Next Book Signing A Event