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

You have to understand repair costs, ARV and many other things.

I would encourage you to break it down into. 1) single or multi family 2) Buy and hold vs flip --I would definitely buy and hold if you have limited knowledge when it comes to property repairs (you can always flip later).  

House can be in need of repairs, but not drastic.

A couple expense assumptions:Insurance: .6% of market value per year ($1300 to $1700 for garden variety SFH)Repair buffer: $50/moPM: 8% of gross rent + 80% of first months rent HOA: Ranges from $0 to $50/mo.

A renovation company that has already completed over 350 renovations for us will quickly do whatever touchups/repairs are necessary so we can get the property back on the market.Use electronics to control access and reduce turnover time.

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.

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). 

@Richard NguyenHere are some of the downsides of putting real estate into a self directed IRA or 401k.No tax deductions: You can’t claim deductions for property taxes, mortgage interest, depreciation, repairs, improvements and other property-related expenses.Property expenses: All expenses, repairs, and maintenance costs must be paid with IRA or 401k funds, and you must pay others to do repairs and manage the property.

@Zachary EngenMost lenders will allow a cash-out refinance of up to 75% of the property’s appraised after-repair value (ARV), not the purchase price or costs.