Replying to Rules about flying US/Canada

Hello, Ive got a question about general domestic airlines in the US. Iam flying to NYC next week and after that iam moving on to Vancouver. But iam having trouble understanding the info on how much extra i will have to pay for my luggage. I will have 1xskibag and 1xregular luggage, and a small bag in the cabin.I think iam going to fly with US airways, from what i can tell they are the cheapest, or do you guys suggest a diffrent airline?

Iam sorry if this sounds really lazy but its so many hard and weird words used on the baggage-info. Any1 who could help me out?