Do you have any building experience? Do you have tools?
If you will be teaching yourself how to opertate tools, it might be better to buy ready-made, if you have the funds?
It is a different "Ball Game" for each of us, depending upon alot of personal things.
To have one's own haunt also (usually) requires a great amount of physical ambition, the kind that powers you to keep going even when you would like to stop. That clock just keeps ticking...can you hear it?
(Insert evil laugh here~)
You sure don't have to provide any answers to my public questions, they are just for you to contemplate, mostly, and I am trying to help you, not being a smart-azz, really.
Good Luck no matter what.