One of the best ways to ensure that a deal is not "too good to be true" is to put the property under contract and begin to work with an experienced lender.

I would have an attorney review the collateral and foreclosure file to ensure everything is legit heading into the sale. 

Just ensure the property is clean, well-maintained, staged how it will be in reality and properly lit.

After that start consuming some of their free content first to ensure you are a good culture fit.  

Here are some ways to increase cash flow from your properties:1.Raise rent: Regularly reviewing and increasing rent can help increase cash flow from your properties, but it’s important to ensure that the rent remains competitive and in line with the local market.2.Improve property management: Hiring a professional property management company can help streamline operations and increase efficiency, freeing up more cash flow.3.Increase occupancy rates: Increasing occupancy rates through effective marketing and tenant retention strategies can increase cash flow by reducing the amount of time the property is vacant.4.Implement energy-efficient upgrades: Making energy-efficient upgrades, such as installing energy-saving appliances or adding insulation, can help reduce utility costs and increase cash flow.5.Implement a preventative maintenance program: Regularly maintaining and repairing properties can help reduce the costs of major repairs down the road and increase cash flow.6.Diversify your portfolio: Diversifying your portfolio by investing in multiple properties in different geographic locations and markets can help reduce risk and increase cash flow.7.Refinance: Refinancing your properties can help lower your monthly mortgage payments, freeing up cash flow for other expenses or investments.By implementing these strategies, you can increase the cash flow from your properties and achieve a higher return on your investment.

Screening tenants is one of the most important things to ensure success as a landlord.

A simple introduction letter would suffice - maybe include any positive changes you plan to incorporate (would ensure they're high probability of happening).

And for the commercial real estate agents out there, what are some steps that you took to ensure your success in the field?

We just tell people that in order to ensure our office maintains the consistency that is required by fair housing, we require everyone to use the identical form for their accommodation request.  

A solution to ensuring this doesn't happen again would be to hire a yard maintenance crew.