Ideally, once you have all the systems in place you take the best deals to flip and then wholesale the ones that don't have as much meat on the bone or are higher risk.Either way, both wholesaling and flipping are challenging and I would consider them a very active form of investing. 

And if it was built around 1900 I would want to know what kind of condition the plumbing system is in and the electrical is probably way out of code.

If so, they are more expensive than a rubber or shingle roofRough Electric- Include fire alarm system on a triplexRough Plumbing- Including gasHVACSprinkler- needed for a triplexDrywallTrimPaintTileKitchensAppliancesPlumbing finishesElectrical finishesFinal Cleaning (negligible in the grand scheme)Landscaping/HardscapingThere are some other smaller pieces that I left out, but these are the majors. 

Apps/systems are great if you're somewhere in the middle, don't have the margin to cover the 8-10% of gross income + 1 month leasing fee, are a control freak that wants 100% visibility/control over your investments, or are a "systems" type investor who relishes operational efficiencies.

I added value by installing HVAC units and updating the furnace systems.

Start putting your systems in place to purchase at a great Purchase price, rehab, CCC (Closing Costs and Commissions) then build in a profit for yourself (10% of purchase price.) 

I updated property information with block/lot info, pictures, and generally organized what was going on within the system.

I have been told that it is kind of a bid system that they are using now.

There are ways to get around permitting when you go to rent out your home and from what I know, zoning/permits are a complaint-based system.

The event is filled with successful investors and very transparent about the systems and processes they use.