If they're off, its because they tend to use slightly lower materials and labor costs. 

I posted about this experience recently: https://www.biggerpockets.com/blogs/8160/71180-we-...With a master metered property, you have a few options: (1) you become responsible for the water bill and include a flat fee in the rent (2) sub-meter the property so each unit is on their own meter, making the tenant responsible (typically VERY expensive) or (3) implement Ratio Utility Billing System (RUBS), this is where you are still responsible fo the water bill but through a formula and spreadsheet bill back the tenants their fair share.

Not much of a difference from apartment complexes other than management fee, payroll, debt terms, and utilities.

If owner pays utilities, maybe set the nest on an agreed upon schedule and then it just is what it is.

I found that the property resides in an unincorporated area with no zoning requirements, but city water and utilities can be accessed.Not knowing where to begin we are hoping for guidance on steps. 

it has utility, grounds, maintenance and replacement cost.

Now as far as renters insurance, you should have the letter from the company they are going to use prior to move in, some require it a week in advance so they know the property is going to be insured by move in date, that can go for all utilities as well, so you have peace of mind that all the important things are taken care of. 

Don't forget the utilize the 70% percent rule and to subtract your rehab costs to determine your purchase price.Using independent wholesalers may give you the opportunity to find better priced deals, but you'll have to do much more leg work to qualify the leads as these groups will not hold your hand as much as the aforementioned. 

Can I add all three into one account then utilize it that way?

You don't get to choose the amount you declare for repairs, utilities, management, etc.