If you don't have a virtual assistant yet, I'd recommend getting one to help with things like tenant communications and coordinating contractors.

He bought the property pre COVID, so his cash flow is definitely going to be different than what mine will be.The question I'm wondering if its a good idea and if the numbers make sense.Purchase Price: $100,000Down payment: $20,000 (20%)Current cashflow: $900Property manager: $90 (10%)His expense for 12 months was only $1,430 (inspections, repairs, management, eviction services). 

Also want to add that she had multiple violations such as having a dog with her while her contract states no pets and she was contacting repair facilities and acting as my agent or pretending to be a property owner and interfering with repair process. 

Maybe have a decent sized pool of cash to take care of the occasional roof repair or personal expense, but almost entirely in real estate?

A HELOC will not allow you to deduct I believe on the interest unless the money is utilized for repairs on your primary residence and not to buy another home. 

Add in property manager, repairs/maintenance, CapEx, vacancy etc and you will be deep in the red.

I had a full inspection and there were some minor repairs done before the tenant moved in. 

I'd two project worked with Robert Mincey, 1.For one project it have serious defect that scares my buyers away, when I ask him for the repair, he told me that I did the sabotage to the property myself, and he owns 0 responsibility for the repair and warranty2.For another project I wanna to fire him but he states I owns him more than $5K even though I already paid him 200% over what he had completed.

I use Executive Villas and they just charged me $500 to repair some table legs and replace the batteries on a remote.

You may need to safeguard the collateral, make emergency repairs, pay for legal notices and filings.