Profit out of thin air! Lease to own mobile home?

[Lark Mercer]

I have a mobile home that I will be buying for $8000 and I also already have a buyer who wants to lease to own for $8000 down and I'll hold a four year note for $12,000. They will pay for all moving cost. I am wondering what hidden things I should look for or be weary of when doing a deal like this? How would you structure it? Certain type of contract I should use? I am basically making $12,000 out of thin air and would like for this deal to stay legal. What legal issues in Georgia are there? Also, the mobile home is currently occupied until purchased. The person buying wants to see the home but I do not want them finding out what I am buying it for. How would you get around this?