Wow...this is open. First I will give you unsolicited advice, then I will answer your question.
If you need this level of help perhaps you should consider a consultant. Do you want rooms or themes? what is your current occupation (what assets do you have?) What is cheap form some is expensive to others. I do all of my own sculpting and molding, so props are cheaper for me than most, Im piss poor at electrical so those effects are expensive for me because I need someone else to do alot of it.
Have you worked for a haunted house yet? Or are you wanting to jump right into owning your own? I would highly recommend learning the ropes on someone else's dime.
The cheapest haunts do do are CNN or zombie haunts. Since both crazy people and zombies are (or used to be) people the sets where you would find them are full of easy to get people stuff. no special time period is required.
What is your location? If you have a wooded trail, then a few old fence panels, some malibu lights, and some costumes and you could have a decent show for just a grand or so. Pick a theme that is easy to do, set it in modern times, and that will keep the cost down.
Think of your goals and then find a cheap way to get there. example
Goal: to have mutants in the show
how to get there #1 aliens are mutating people
#2 genetic research gone wrong
#3 Inbreeding hillbillies
The research lab is to expensive of a set to do and have it look right, an alien space craft or facility could also get expensive, but hillbillies are cheap! so go with the inbreds.
It would be easier for us for you to tell us your goals and then ask for help getting there cheaply. Your post kinda seems like you want us to do all of your planning for you.