Wirelessly connect my internet to my node

Greetings Folks, Super newbe here, I have been searching the articles for a few days trying to understand how to solve my delima. I find lots of great articles but they don’t address my specific situation. I have 2 issues I am trying to resolve.

Issue 1: 
I have my Node on my roof, and a wired lan from my roof into my master bedroom. My comcast internet gateway enters my home in my basement away from where my node is. I need to be able to be connected to my node and still have internet. Running wireless and Ethernet is not working it seems when I run Ethernet to my node my everything I try to do runs through my mesh.

Issue 2:
How can I set all this up so that I can connect to my mesh node with my cellphone or tablet wirelessly.

My thoughts I just dont know if will work!
I have an unused apple airport, connect my node to my apple airport’s WAN
Wirelessly configure my airport to be a bridge from my comcast cable modem/wireless router.

Is their any reason why I can’t do this? If I cant can someone share with me a simple solution in simple terms?

Thanks

Thomas
KF7EBX