Money is as above Cloud 999. minus the bond for the first 18months if they take you NTR. You get this back after 36 months though.
West Bay or The Pearl is where a lot of the guys live, you could maybe source something for the 12000QR. However most people pay 15000-25000, depending on tastes. Some of the wide body guys share and make nice money, biding for the US flights to see the family. The Pearl is 25mins-45mins from the Hardies Car Park. Normally one direction you will hit the traffic, the other will be midnight/2 am. So quite, just take care!! subtract 10-15mins for west bay. A lot of guys stay at Ezdan Suites while finding there feet in Doha. Training takes 6months min NTR, 4months TR'd narrow body, longer on the wide body. Bond is taken from day one, so money can be a bit short during this period if fixed outgoings are high or you still have commitments back home.
Banks give car loans after 6 months, driving is dangerous here, many accidents and it is an issue for the authorities. Petrol is very cheap though so, it is possible to indulge in some cubic inches.!
Sailing, there aren't clubs like in the UK. More like the french, with sailing centres. Where you can hire a Laser for 100QR an hour. Wind is generally 5-10kts, however there are very windy days during Shimal season. 25-35kts.