I put out marketing packages based on actual numbers because all experienced investors will do their own underwriting and make offers based on real numbers but this is hardly the norm.It would behoove you to look at IREM.org as they have financial information from local property managers in every major market and they'll give you the real numbers when it comes to the cost of repairs, water & sewer, heat, electrical, payroll and other information.Once you have this, you should start practicing underwriting deals with your own spreadsheet or one like RealData so you can learn what a deal will actually make versus what BS brokers put out to market.

I have considered the electrical lines etc. nothing is in the way, besides a wood fence (I own) that I dont mind breaking. 

they have been there 5 years without a septic cleaning.

We went to look at it toward the middle of March 2015 and there were holes in walls, missing fixtures, odd electrical (the wiring for the back porch light and exterior outlet have been pulled into the master bedroom), tiles missing in the master shower (green plastic was duck taped across 2/3 of the surround so they could use it anyway), and cabinets missing that were not that way in November when it was listed with our Realtor.

The outside is complete and the inside is framed with electric, plumbing, and hvac finished. 

Is the slab insulated (underneath) and heated (hydronic or electric in-floor)?

The property has a new HVAC system and new electrical. 

To help responders you should illuminate the type of plumbing, if the electric is knob-and-tube, etc.

But apparently there isn’t a home on the land... instead a garage with water/electric?

I do a lot of work my self, but on plumbing and electric i get a pro.