and this is to set the deck only correct ?
Yes
so after i set my deck do i just plug the rca's back into the amps and use the + and - wire set to set my gain's on both my amps at the volume my deck go up to with all settings on my deck turn to flat and even on my amps
No. DD-1 clip to ground, put the probe on the + on the amp.
Did you even open the manual? It tells you how to do ALL of this
yeah i did read it i was just confuse about the head unit part where it told me to turn everything to flat