Need help with mig machine set-up

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Ok I just took my asme 2" 6g test and passed today. (6010/7018) The head cochise wants me to practice up on my mig and get that passed also. I am a newb when it comes to pipe welding or for that matter any full joint penetration with mig welding. The machines he has are lincoln flex 450 I believe, not sure of wire size. My question is how do you dial in this machine or set-up close to weld decent? also any knowledge on land and gap size and how to run the root would be much appreciated as I have never done a full penetration with a mig. I suck at setting machines up to weld so I don't want to spend thirty minutes do that tomorrow so thanks in advance. also it will be some thick wall 2'inch I will cert on and some 4" 80 schedule I will practice on I think. any basic help or comments I would appreciate I.E. volts/wire speed ect......all solid wireJerodHypertherm 30Miller Syncrowave 200Millermatic 140and a propane torch and hanger if all else fails