Hey, Welcome to Doha
for 1st question: you may only need your clothes with you, and if you don't have something, you can buy it easy.
2nd and 3rd questions: at west by, i actualy don't remember how many rooms in each villa, but if not wrong 3 rooms, but it is nice place.but you can get good villa with swiming pool at Daffna.
4th question: it better get semi furniture, cuz you don't know the situation of furniture either good or bad, or maybe you don't like it. and even if you call for replacement, they will take loong time.
5th question: Sorry i don't know wat you mean on that??.
6th question: first of all, if you have driving Licen then better get rent car, cuz it will be very difficult got Taxi here, and even if you call , they will come late.
7th question: No one will ask anything, just respect the culture and religion here, and nothing wrong will be there.
8th: The Resource of Contact in case anything you need, you have American Embassy, or you can ask here (QatarLiving), and ppl here not hesitate answering you anytime, and welling help you

All the Best