Just another perspective, I work for a developer that does their rehabs with integrity, and specifically with the goal of holding onto properties long term and minimizing maintenance costs.

What is the integrity of the houses' systems and when will they need to be replaced (capital expenditures)?

Berkeley and oh, oodles of years of professional writing, blogging, social media, newsletter and journalism experience.  

What sources for properties are most valuable for you to have integration with?

Welcome to Bigger Pockets social media, good to see IT folks are moving into real estate, I am new here and I am working in IT company, I started learning about real estate investments. 

@Cosmo Lee, Welcome to Bigger Pocks Social media, We all new here and starting learning, lot of good people here ready to help anytime.

-Incredible reputation with local investors, with lots of work done through referrals... and a reputation for integrity, tenacity, and professionalism.  

Why even record the details - use a program that does the integration for you or if you receive checks use a program that when you scan the checks it automatically enters the payment for you in QuickBooks in tenants name. 

The media dogs young black males so hard that even black people are becoming fearful of them.

Have you integrated some kind of Phone App to field tenant work requests, accept rent payments, etc.