From Munich Airport to Courtary City East

Hi All,

I am arriving Munich on the 27th May in the morning at 5:45 Hrs and have to get to a meeting in Coutryard Hotel City East at 8:00 Hrs. Can someone help me with the following.

1. Is it enough time from the Airport to the hotel?
2. Which service Train/Bus/Tram should i take, my first research say "S8"
3. Do i have to book the ticket online or can i get it at the station
4. What if i take a Taxi? how much would i cost?