SS99,
And to completed the answer of Onthouse, i can answerd your fourth question:
If you used to the UAE, be prepared for a chock coming here.
Nothing is really organised, Qatar is probably the country with the highest density of idiots per square kilometer (lucky qatar is one of the smallest country in the world.....).
On the road already you will have a marvelous example of the stupidity of the people.
Qatar is probably the only country where you need a Visa To EXIT the country, and pay for it of course!!!!(they donīt known what to do with their billions of dollars but anyway...).
Night life, nothing to compare with UAE.
No really...itīs an intersesting place....
cheers.