You'll screw up and lose some money, maybe even a lot of money.

The tenant has not been the greatest, one example being late on paying with not always paying the late fees.

This could include keeping track of the construction holdback.  

If you just grab one off the Internet, it will have a lot of holes.

I have some I will be posting that have turned up.  

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

I have placed on all the free sites and start getting requests but is slow, any ideas or experience on which works the best?

All except one sold for the highest price point at the time of sale.

After working a long night shift that ended at 6:20 AM, I shut my eyes and prayed, thanking the Lord for the day and asking for rest and guidance.

Look up @Derek Sherrell (ThatADUGuy).