Sam,When you obtain your pilot training, you do it in a small light aircraft. The flight characteristics are similiar to most other small light airplanes. You'll be getting your first few jobs in small light airplanes.
You needn't worry about training for specific large airplanes; flying one isn't realistic for perhaps the first ten years of your career. You need to concentrate on just getting the pilot certificate. Once you are commercially certificated, you can begin doing entry level work. This may include traffic watch, fish spotting, ferrying parts, following powerlines, towing banners, etc.
If you obtain your flight instructor certificate (highly recommended), then you will likely spend a year or two doing dedicated flight instruction for other pilots.
As you move up from job to job into bigger and more complex equipment, it's the responsibility of your employer to train you in that equipment. Many schools try to lure students by offering time in a B-737 simulator or some other ridiculous proposition. However, this is a farce; it isn't realistic, and no student is going to retain something so out of their depth.
You don't need to worry about the airline you hope to work for...that's something you compete for many years down the line once you've gained all the proper qualifications and experience. Don't try to train for an airplane that they fly, either. Just concentrate on learning the basics right now; learn how to fly. Then you can gradually build a career.
Good luck!!