T&C = terms and conditions, GF is an established worldly airline in comparison to WY which could be described as a desert charter outfit trying to become an airline. Base pay is about the same but with allowances a GF f/o takes home more than a WY Capt if that gives you some idea.
1) A fly on the wall reports GF will be using MCT as a base probably sooner than later, indications are you could see half the fleet in MCT someday. There is also a big plan to expand MCT with a new terminal, 2nd runwayand and maybe 3rd runway by 08.
2) Many, think of flying for a commuter airline vs a major.
hope this helps, also look into getting a JAR license or expect to waste alot of money and time doing a bridging course in Doha.