Single Family: Can you find a house with a separate walk-out entrance/exit?

I want to understand how to structure the finance terms.if for example the house is on the market  for $200K1. how much do i ask for down payment2 going interest rate?

Now this would mead changes,...and an enormous set of problems from those changes.   

BP is helpful but it is not set user friendly for beginners.

I'm looking into potentially house hacking a small multi-family home, preferably in northern NJ (such as Morris county) or Westchester, NY if possible, but I'm open to other areas that are hopefully within about 1.5 hours (driving or public transit) of Manhattan.

When looking into getting my first flip or rehab house there are all kinds of work that I am curious of and other people's experience.

The house at that time was probably priced around 1.3 million.

We tried setting up direct booking for our repeat customers to save both of us some money from Airbnb’s fees.

This will be an architecturally interesting building on 2+ acres with power gate at the road and fairly long driveway that sets the house out of sight from the road. 

We have marketed the property through 2 local brokers and in house.