re: OT- St Augustine Grass

I have a question on this topic. I have a small side yard on one side of the house which is mostly in the shade--we're talking about 10 yards by 25 yards. It has a moderate slope and I really want to get some grass growing on it this Spring. Do I get some dirt hauled in and then level it up to plant it? Also, I didn't want the dirt to wash away so I'm guessing I may need a retaining wall or some kind of support for the sod which would be on the downhill side? It's pretty much just rocks with very little grass right now.