P0301 code with a 1st cylinder misfire come up?

I had a P0301 code with a 1st cylinder misfire come up on my 01 Pontiac Grand Prix GTP. It was sputtering, had a loss of power, motor shake and it almost died on me when I was trying to make it back home. I usually store it in the winter but thanks to the drive shaft falling off and some other issues and damage it caused on my Chrysler 300C that I can't afford to fix and causing yhe death of my 300C, I need to get the GTP running right so I can get to work. I had a similar code come up on my 300C and shortly after the fuel pump went out so I decided to beat the GTP to the punch and changed out the fuel pump. The previous owner put headers, a smaller supercharger pulley and some other upgrades on my GTP, which makes it a ton of fun to drive when it works right lol. I'm changing out the spark plugs, wires and ignition coils to see if that helps fix the problem but I have never changed any of these on any of my cars before. I know there is a certain firing order to putting in the spark plugs and I'm going to look that up online. I'm wondering if the wires need to be put on in this same order? I also would like to know how to take the wires off the motor, how to put the metal tube on the wires that go into the motor and if I have to do anything specific to the end of the wires that go on the spark plugs? Also if the ignition coils need to go on in any certain order and if I need any type of special grease on any of the parts? If new plugs, wires and ignition coils don't fix fix the problem, what else should I be looking for? I also had a P0452 EVAP system pressure sensor/Switch A circuit low code come up since changing out the fuel filter and I'm hoping you can tell me what that means, what needs to be fixed and if I can drive it with this code? Before storing it I had an O2 sensor code come up and the O2 sensor after the cat has been unplugged and bypassed, and I can't find the sensor that's supposed to be on the back side of the motor. I might be looking in the wrong spot or is it possible to override that sensor as well. It hasn't coded on the O2 sensor since changing out the fuel pump but that's not to say it won't code in the future. I'd really appreciate any help you can give me, thanks!