Stephan Schiffman's Cold Calling Techniques is one of the most practical sales books I've read. He has written many others, too.

Dan Pink's To Sell is Human is excellent, too. It takes a non-traditional look at selling and helps understand some of its psychology.

Beyond that, I don't have a lot of specifics. There are many sales methodologies out there, and you should use one. It's not important which one you use -- just that you do adopt one.