I've had good experiences with positive training basic obedience classes, too.
The training at the one Nutmeg, Romie, and I are going to now thinks the "watch me" is a good command to start with. She also suggests marking every desired behavior with an excited "yes!" -- a variation of clicker training where you don't have to carry a clicker with you. Other early commands have been "leave it," "take it," and "drop it." You do leave it/take it with a tasty morsel in your hand, let the dog smell it, and say "leave it." When the dog first looks away/moves its nose away, you say "YES!" and make a big fuss. When you're ready, say "take it" and open your hand so dog can take the treat. "YES!"