To add on to what the others said, here's more info....

A picture of some popular chord progressions. Once you know your key you can take any path and write a chord progression:



Here's the page that came from. Nice intro to theory if you haven't had much in the past:
Songwriting Tips


Another cool reference, the circle of 5ths. Shows you what keys have the amount of sharps and flats and their associated minor keys on the inner part of the circle:




Steve

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