I can't remember if your amp has a high level input..... If so use that. If not, go buy a line output coverter. It will take the powered signal and reduce it to a level the input of the amp can see.
Also, the monsoon deck has a remote output (turns the amp on). There is an empty pin location....You'll have to build a pin to fit in the harness, or pull one from an old harness.
My honest feeling though, if you did not know how to get signal to the amp when the deck doesn't have an RCA output. You don't know as much as you're telling me. That's okay.......Everybody has got to learn somewhere. But, you have a nice car and this is a fairly difficult install. If you can, pay a professional to do it.......
If not, good luck and I'll help you the best I can.