Probberly? There?
Anyway, these are standard FE answers for your questions:
1. North on a compass points towards the center of the disk, east and west describe a curved line concentric to the disk, south points towards the rim.
2. I don't know.
3. I expect this falls under the aegis of "conspiracy".
4. There is gravitation due to either the earth's upward acceleration (see einstein's equivalence principle) or the mass of the earth, depending on which model you go by. There are many threads on this.
5. I don't know, but they would probably say the atmosphere extends to the same altitude as in RE theory, to account for amateur balloon photography, etc.