How do I get past first blue zombie with nicks head?

Once you put nicks head on the zombie you should get a mini game where you have to press the same button on the controller that appears on screen before a timer runs out. When successful the zombie will either blow up a section of the wall or lift you over allowing you to progress further. Oh, early warning, every level has one of these nick/blue zombie mini games in it, so better get good at 'em

How exactly did you die there? There's nothing there that can hurt you. If you're referring to the mini-game that you have to use Nick for, just press the buttons as they appear until Nick does something other than walk.

First you got to cut down the collumn that a cut scene shows you after one of the school's school buses breaks through the wall and starts coming after you then go to the headless blue zombie to activate a minigame where you have to press the buttons that show up on your screen to get nick to take a gas can to a pile of rubble to blow him and the rubble up to clear a path for you.