Mbo: There are several ways to play a harmonica. "Straight" means you play it in the key it was designed for. When you do that you blow the tonic note. You can also play it a fifth above the key for which it was designed. So a C harp can be played in G. When you do that you wind up drawing (sucking in) on the tonic note. Other names besides "draw" for this style of playing are "cross-harp" and "second position". It turns out to be easier to "bend" to missing notes in cross-harp and so the blues players tend to prefer to play that way.

By the way, one general comment. If you are going to use "canned" lessons such as tapes or videos, you should probably get a C harp. Most lessons are based on that.

Murray