One of my goals is to have a second revenue stream so how should I go about utilizing and leveraging these two properties?

(no affiliation other than as satisfied customer)

Then again a lot of tenants get HEAP so they get assistance for their utility bills & haven't complained.

You are not their only customer and a contractor knows you do not get all jobs. 

Tennats pay for all utilities.

As I get older, the "usual"responsibilities of life are becoming more and more apparent (Rent/Utilities/Groceries/daily life costs).  

Is there a way to utilize the loan manager in Quickbooks for mortgage payments due to us?

We worked out a creative custom financing deal with Providence Bank to acquire 2  x 4 unit buildings by leveraging our equity in another building.

IRAs would require separate entities.The Solo 401k has additional tax benefits over an IRA when investing into real estate using leverage.The penalties for prohibited transactions are less severe, though it's best not to utilize this benefit :)

There are many online tenant screening services that offer a wealth of blog materials that you could probably utilize to learn more about different areas of being a landlord and screening tenants for the first time.