Hello again Michelle!
I'm truly happy to help! There are a couple of different scenarios for the fireworks/evening shows, so I'll try to go through them with you.
If Wishes or Fantasmic! is scheduled prior to park closing:
Rides will remain open at Disney's Hollywood Studios until park closing.
Rides at Magic Kingdom will remain open until park closing.
If Wishes or Fantasmic is scheduled at park closing:
The ride queues will be closed at park closing. If, for example park closing and the shows are scheduled at 10 pm, then no one will be allowed to enter the queue after 10. Those in the queue at that time are permitted to ride.
Yes, the TTC is where you will park for monorail/ferry access to Magic Kingdom. You can also catch a monorail to Epcot from there, and busses to Disney's Hollywood Studios and Disney's Animal Kingdom.
Have a magical vacation!
Amanda