Hi flyingdirt
I currently don't own a detector of this forum's namesake, but I'm looking to buy a C$. So I can't help you with your settings yet. It would help if you said which detector you are using and I'm sure some of the guys on here could point you in the right direction on that.
Yes, you should be in a target rich envirionment. However, more than likely this house has been detected before and some of the easier targets have been thinned out. Also, the older coins are going to be deeper and the sound that you hear will be faint and not so clear as the loud clear sounds that you hear from a shallow target. Good targets should still exist there, but perhaps not as abundantly as you are dreaming of.
My advice would be to grid you off a 10X10 spot near the front walkway and dig every target you hear. Especially those 6" deep or more. Detect it N-S, the E-W, and then diagonally from both directions.
Even this might not turn up a really old coin, but it will give you an idea of what is there and how old. After that you may know what to listen for and find more than you first thought.
Be sure to cover all the ground. I used to go behind my buddy and find things and he would say, "I was just there and I didn't heare anything". He didn't slow down and overlap his swing and then I would go to that deep target that he had missed. So slow down and make sure you have your coil over every possibility. There are things that are still there, you just have to work to find them.
Good luck!