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For screen sharing via Ethernet cable read this

OS X Mavericks: Connect two computers using Ethernet

You can use an Ethernet cable to connect two Mac computers to share files or play network games.

Connect a standard Ethernet cable from the Ethernet port on one computer to the Ethernet port on the other. You don’t need to use an Ethernet crossover cable.

If your computer doesn’t have an Ethernet port, try using a USB-to-Ethernet adapter.

On each computer, open Sharing preferences and note the computer name for each computer.

In the Finder on one of the computers, choose Go > “Connect to Server,” or cmd + K then click Browse.

Double-click the other computer in the window, then enter your password, if necessary.