Since you want to keep it simple, then just start with the USAir credit card:
http://www.mostmiles.com/apply/Landi...cellNumber=163

You will get 40,000 miles plus all these benefits:
# Up to two $99 companion tickets annually
# Preferred check-In
# Preferred Zone 2 boarding
# One complimentary US Airways Club day pass annually
# Discount on annual US Airways Club membership
# Exceptional travel benefits
# Preferred dining and entertainment experiences
# World MasterCard Price Protection and Zero Fraud Liability

If you want to go farther, then take the time to do some research and find what works best for you. As others have noted, there are many opportunities