allright buddy lets see how we can help you out .
for props look up monster mud and look at terror syndicates website for info on that.
for walls it depends on your location and budget. either you can do plastic if weather dosent affect you or you can do wooden panels. Panels are more expensive but you can use them for years on end, plastic will be lucky if it lasts you a full season.
Check out my webstie www.hellsgatehaunt.com and go to construction photos and you can see how wooden wall panels work.
Also see how much money you got to work with and then see how much room you got to work with and get back to us.
Owner of The Fear Experience Haunted House
in Cleveland, Ohio, voted the #1 haunted house in Ohio, and #14 in America by Funtober. The Fear Experience Haunted House was called the premier haunted attraction in northeast ohio by cleveland.com and #1 in cleveland by metromix.