I would personally run PVC in the walls to run network cable through. It's not necessary, but it just allows you to swap out/upgrade cables in the event of any issues, and for the purpose of future-proofing. If you don't want to spend the money then just running network cable is fine too. Be sure to try to avoid power lines.
You can get Ethernet (RJ-45) faceplates from numerous places. Monoprice has very affordable prices, but anywhere you find them will work just fine.
I would also run the cables to a patch panel, just for convenience. They're pretty cheap, and having a labeled connection would make network maintenance easy. You could also plug the connections from the patch panel into a Gbit switch, and then have the switch go to the router.