Your best bet is to sketch out what you want and send it to the manufacturer...or maybe a couple different manufacturers. There are many types on the market, some better than others and there are lots of design considerations but they all require a solid footing and possibly multiple courses below grade. Drainage behind the wall is also very important since hydraulic pressure is a retaining walls worst enemy next to a poor foundation.

Personally, I think the flat face style looks much more professional than the castle wall style pictured above.



"The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge." Stephen W. Hawking