Casting a stone wall.

[Saltwater Cowboy]

Mornin' all! Thought I'de jump right in with my 1st question here on the Blue since I've been elsewhere. I am working on a church scene on my layout and would like to replicate a stone wall that would border the property. The wall must be of a New-England style and be somewhat decorative. Not just a pile of random rocks. After searching around for a commercially available one to use, I have not been able to find one that suits my tastes. Therefore I will try to cast my own in plaster. I have not attempted this task before and am looking for a quick "how-to" with some tips...Thanks in advance!

Matt