Supertight is ok for the first 3 to 4 levels in a tourney, but then you need to open up greatly .. actually up to the point off pushing all-in preflop with any two trashy cards to not get blinded away

It's a too vast subject to cover here and I am sure you can find a ziliion post on the subject in the One and Multitable Tourney forum

But basically I suggest buying Harrington on hold'em .. Vol 1 will teach you how to play tight conservative but good Hold'em i the early stages
Vol. 2 will the you when to simply push with trash