Hi! Please, help!

My friends and I plan to take a bus (airbus21 ?) from the airport to Mongkok (Geo Home along Nathan Road:

1. Where should we get off? What bus station?
2. How much would it cost us?
3. How long is the travel time?

4. From Mongkok, via MTR, how do we get to Disneyland?

We also plan to take the bus or MTR going back to the airport in time for an early morning flight,

5. Where do we take a bus form Mongkok to the airport? is it still airbus 21?
6. Until what time is the bus service?
7. What about the MTR, until what time does it ferry passengers from MOngkok to the Airport.

Thank you so much.