Tiaght and aggressive is a very good place to start on MTT's
(other aspects to your game can be developed later).
The "bible" on tournament poker is the Harrington on Hold'em series (vol I II and III). What you will learn from this of most significance (IMO) is moving through the gears in a tournament. You should almost always be aggressive when you enter a pot, however as your chip stack decreases as a multiple of the blinds, you need to become looser.
In a tournament you should always be aware of your chip stack and your opponents chip stack in proportion to the blinds - this almost becomes more important than the cards!!
I spoke about it a little here -
Playing an MTT when Short Stacked and followed it up with this:
Red zone Strategy in action