Are you a leader or follower at the milonga:
You can still choose lead or follow for each individual class you reserve. * 
Are you signing up with a partner or by yourself? *
How long have you been dancing tango?
New dancers: Minimum level is pre-intermediate, with good floorcraft skills
Who are/were your (most important) teachers?
We mean the ones you take/used to take WEEKLY classes from, not the famous ones who passed through your town some weekend. *