Or is it best to have contractor wire it.

Regardless of whether the owner turns a profit, brokers are called up on to sell, lease and manage, lenders will finance, contractors (often affiliated with PM companies will be called upon to put out the constant fires).

My wife works for Ferguson, and I know many contractors, so I can get a lot of materials at cost.

With this property I racked up some credit card debt, around 20k and I need another 20k to pay contractors/supplies.

Each of the 5 warehouses on this campus will require updates (construction of offices/bathrooms, roof repairs, paint, siding repairs, new penetrations for doors, updates to electrical, insulation, and extension of water and sewer). 

Also, how much did the electric and plumbing fixes costs?

There's lots of opportunities in developing neighborhoods, but also seems a bit saturated at the moment.Also, definitely budget security (remote control cameras, alarm system, etc.) for your properties, as there are a lot of people who occupy themselves by breaking into houses and stealing anything they can sell.Lastly, there are a ton of contractors looking for a quick buck.

Lots of great info on here as well, and like they're saying the best thing to do is to find an experience broker / realtor who can help you navigate which neighborhoods to target and which ones to stay away from, as well helping you to build out your team for property managers, lenders, inspectors, contractors, ect.

I’m looking to network with other investors and contractors who share a passion for the local market.

Having trusted resources in market have been helpful in managing our properties and contractors especially when my non-real estate related consulting business is in its busy season.