Alright, you're a lucky bastard. This is my 1000th post. I was saving it, but you get to have it. Congratulations.
Choose two colors that match your personality best. Here is a color wheel:
Start buying packs, preferably from M11 or the upcoming M12. Prerelease for M12 is this weekend, get to your local hobby shop.
Buy as many packs as you want, then buy a starter deck of the two chosen colors. Make a deck of roughly sixty cards, following this pattern:
Card
Card
Mana
Card
Card
Mana
Repeat until you have roughly 60. This won't win you tourneys, but it's a good start.
Play with friends over and over, refining your deck. Also, use cards you really really like.
Visit the magicthegathering website, the articles are great.
My biggest piece of advice is to keep playing, keep enjoying, keep having fun, and above all, get a 20-sided dice.