basic running power

Stuck in a very bad situation with wiring right now...heres some background on my story

Got a 91 Firebird--with vats : (  -get to that in a minute..That I recently put new heads on. Everything was going good up until I go to start it. Accesories came on, all lights, everything...everything but the starter, fuel pump and injectors..Naturally I thought this would be vats, so I tried to do the whole resistor trick..No dice. Tried it in park and neutral..nothing..not even starter click. So i get some wiring diagrams, double, triple, and quadruple check every single wire in the engine bay-all in the right place, all have power running where it needs to be. But no start...so I called a mechanic..came out, played with a bunch of wires and got the starter to crank, but still no injectors, or fp.

Since I have a first graders understanding of electricity, I came up with this basic idea of how to hot wire all of these things. Not sure if its right but heres my best shot.

1: Run Power Wire to Device

2. Attach switch to wire

3. Attach fuse to wire

4. Attach ground to wire

5. Attach other end of wire to +battery terminal

This should give me on/off power for each thing right???

2.

It's better getting a multimeter and tracing etc. Have you checked your ignition relay? They are often DPST (2 circuits/poles, both on-off) and have a SERIES diode with the coil (for reverse polarity protection). Find that and check its operation (and diode). You are better off bridging things like that rather than supplying power. (But make sure your battery is connected with correct polarity - check with a multimeter (albeit rare, but batteries can be mislabeled!).)