[E Sully]

Don't worry, most of the members are more than happy to help. First start can be very nerve wracking.
As you found out the first is a test port, and with a jumper installed is used to set base idle, which on your 1987 will be 880 rpm.
The bottom 2 sensors for the speed and reference sensors can be confusing since they are so similar. Having them reversed would cause a no start, but no damage.
The other connector I can't tell exactly what wire colors are there from the picture. It could be the heater circuit for the O2 sensor, which would not cause a start problem. It is used to bring the O2 sensor up to temperature quicker on cold starts. According to the circuit diagram the wires would be yellow and brown. Your picture seems to show yellow and blue which might mean something different.
Pull a spark plug and ground it while checking for spark while cranking. Full pump only runs while cranking and when the engine sensor detects rotation. Do you smell any gas while trying to start it? If the DME relay is not working you would get a no start, do you feel it click when you turn the ignition key to start?