the hose missing from the nipple goes to the nipple on the wastegate

rewire your o2, its a simple hookup, personally id replace it

as far as the plugs go i have no idea, pretty gimp picture to try to tell you where they go or what they are for

and crankwalk is a myth....fix that simple shit, get you some fuel, a 50 trim, and a nice exhaust w/ open dump and have fun scaring little kids while tq steering everywhere you go