1st there is visit visa for 15 days u can extend it other 15 days then u have to leave ( people go to Bahrian and then come back it is issue of 2 hours)
2nd i don't think there is problem with customs but my be they will provide u with resdince with furniture
3rd silly question there is no condition or test for arabic language in driving license test
4th there are more than one american school and french school in Doha