@Darren James  Either do a standard rental or sell on owner financing (Note/DoT). 

Looking to do owner finance, is there a standard for down payment 10% 20% 0%?

ALSO" (i) Multiple accessory dwelling units within the portions of existing multifamily dwelling structures that are not used as livable space, including, but not limited to, storage rooms, boiler rooms, passageways, attics, basements, or garages, if each unit complies with state building standards for dwellings.

For the first, try to get a sense of what various subs charge in your market per hour; for materials you have google and carrying costs include PITI, utilities, permits and fees and other standard costs of ownership. 

If you're seeing red flags already, I can only expect to see more in the future.I know this will take more work, effort, and time on your end, but EVERYONE that works for you must be held to your standards.

I read a lot of different posts about how to handle laundry and lawn care but I was wondering what was standard in this area. 

My question is, what is the standard rule of thumb about requiring a certain number of nights in prime season. 

My agent told me that $1,000 is standard and I've heard a few investors put $100-500.

They are much more complicated than a standard loan, when someone is buying their 1st home. 

Yes you may use a portfolio lender or standard lender however the issue with that is their underwriting takes too long for the fix and flip game.