Newest Update.
Where do the diodes go? Where do the relays go? What diodes and relays do I need to use? I have read the Ultimate security thread on NASIOC, but not all of my questions have been answered.

This is pretty helpful, but I am having trouble interpreting some of it.
What/where is the N/O momentary switch, and how do I wire that part?
What/where is the ECU B136 connector?
Where are some good places to mount the siren?
Where are some good places to mount the brain?
When it says black/white to white, what does the "to white" part mean?
What/where is the combo switch?
And, when I multimetered the constant 12v, I noticed, it is only 12v when the ignition is in the on position. Is this correct?
As always, thanks for the replies!
-Chris