If you have reserved tickets do you still wait in the general line?

Yes and you should get there early. You have to go through security.

Yes and it's a good idea to be there 15-20 minutes before you actually want to get in

Yes, everyone waits in line. Also know there are 2 entrances into the museum: on for groups and the other general admission. You'll have a 1 hour window to scan your ticket (after inside) so make sure you arrive early in case the outside line is long.

Yes, everyone has to go through security outside. Once inside, you can line up for the main exhibit with the others who have tickets.

Everyone has to go through security prior to entering. Once inside, you can go directly to the elevator for the main exhibit at your scheduled time.

Nope