As Mark Cohen has said, in practice whenever you see Adim, for example, it really means Adim7. I think a college theory course might talk about a dim that is not a dim7 but it's never used. We had a thread about that once. You might also run across a reference to Aº which is a way of specifying dim7 chords that jazz musicians use quite a bit.

As for sitting in front of you, as much as I'd like that I doubt I can make it in time to do you any good. The next best thing is the Online Guitar Chord Dictionary link I provided above. That will give you graphical chord diagrams for just about any chord you want. It's "the next best thing to being there."

      - Mark