Currently Being ModeratedMay 2, 2013 5:23 PM (in response to therjth)
First, are you using Wifi for Internet on the MBP?
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list, Wifi on the MBP.
In Shating on both, enable File Sharing, Screen Sharing, & Web Sharing on both.
Then with the Ethernet cable between the two, find the IPs of both, or use Finder>Go>Connect to Server>Browse... see what shows up.