My goal is to invest in Multifamily properties (2-4units) and eventually grow into larger apartment complexes (25+ units) as a means of creating a sustainable business that generates passive income to support my family, my community, and if God is willing then myself as well. 

any suggestions, website or article  reference would be greatly appreciated.  

My wife and I were missionaries in the Philippines for three years and our motivation is to generate a residual income that will allow us to go back and start an orphanage.Here's my first question: we are analyzing every property in our area of Monroe MI, and we want to make offers that makes sense according to our numbers on the properties that fit our criteria.

Each address would generate a postcard to my mailbox.During the last year, I received four or five postcards/letters a week from wholesalers asking if I want to sell my rental properties.Over the last two months, I receive at least one phone call a week from wholesalers pestering me about if I want to sell my rental properties. 

That is your long term solution to generating quality inbound leads over time. 

Is there an app or website where I can look up title & who has their mortgages paid off? 

Generally you want higher income two years before you apply for financing, so you could change your tax strategies depending on which years you need a loan.The most interesting real estate tax tactics to me are the 1031 and cost-segregation depreciation.Also, as a retail business owner, you can qualify for some SBA financing that will allow you to owner-operate commercial real estate to where you could run your store in a building while renting out some of it at the same time to generate that income.And for commercial you can use the income from the target property to help your income.

Are there any legit/honest websites that will help out with the process?

The online AirBnB websites are required to send the city listings of all properties registered on their Website.

Additionally, when you create your listing on cozy, it is actually posted to multiple websites making your life easier. - https://www.zillow.com/rental-manager/   - I'm sure you've heard of Zillow.