There's a lot of great music theory tutorial sites out there, just google "music theory" and go from there. Little by little you'll start understanding it. As far as why I-IV-V, or different variations on that "work", like it was said above it's just what your brain has gotten used to, from being exposed to that type of music from the time and place you grew up in. In order for something to be music and not just random sounds there has to be some sort of pattern that your brain can latch on to and say "that's where this is going". Those patterns or rules are to a large extent just cultural. It's alot like language.
But you also want to break the rules periodically, and create tension. That's what makes a peice of music interesting and unique. But if you stray too far from the rules, it becomes less a peice of music and more just random sounds. So experimenting with chord progressions are a game of playing by the "rules" while occasionally straying from that here and there. Ultimately just keep playing around with them until you hit on something that sounds right to your ears.
Welcome aboard by the way.
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