the firing order is 1-5-3-6-2-4
spark plug type is usually platinum
best fluids are Nissan factory coolant and oil (available at your local dealer)
stroker needs maxima LD28 crankshaft, KA24 pistons, L24 rods, a P90 head and 1mm head gasket (some of these can be changed)
intercooler piping should probably be about 2.5"
3" exhaust is awsome
for 350+ hp you will need bigger injectors, bigger fuel pump and bigger turbo.
i like the NOS fogger kit for nitrous.
hope that helps