Vrbo automates the basics, but beyond the basics I will promptly answer.

To help expedite the rental unit approval/inspection, you can also talk with your local housing provider that runs the Sec 8 program what basic items they look for and make sure you have those covered. 

I bought 14 houses basically for free by harvesting the equity in my houses by doing 5 cash out refis.

Scope of WorkThe Subcontractor agrees to perform the following work (“Scope of Work”):Detailed description of tasks and responsibilities.Exclusions: [List any exclusions here].Materials to be provided by: [Contractor/Subcontractor].Reference drawings or plans: [Attach if applicable].2.

@Tamika Davis One of the biggest advantages of most software on the market is to complete these tasks you mention (maintenance, leases, rent collection, etc). 

Basically wholesaling would've been the best but there is alot of negative comments about wholesaling this days.So what is the best way to make small income with $0 from realestate and also grow along the way?

Just brief research is showing about $300-350/sq ft for basic build.

@Lionel Quiambao I find that the most basic speed offering works fine in my units.

@Chris SeveneyRight, Its basically impossible to know for sure the "extra" cost - unless we bring is some kind of engineer -  which is total overkill. 

The basic structuring of a real estate investment does not fit into their constructs.2.