My Starlink dish is far from my house due to trees; the cable runs into my garage where I've placed the Starlink router. 

I plan to bypass the Starlink router and run a Cat6 cable to my house and connect it to a TP-Link router or Deco mesh system. 

Here's another complication:  The part of my house where I'll run the cable into is 15 years old and has good internal wifi ability.  But the other part of the house is an old two-story cobblestone whose walls won't let wifi through.  So I'll need to backhaul a cable to an access point in the cobblestone, and connect to one or more other access points via wifi.

How would you configure this and what TP-Link components will I need to buy?

Thanks much for your guidance.  I'm a neophyte with all this, so simple non-technical language is very appreciated!