Nonetheless, I challenge you to think about a plan for acquisition, for improvement, and for dispossession.  

I made $600 in income in 2018 via a referral to another agent, and that's all I need to feel confident about deducting more than that in allowable expenses.

Or, perhaps it is one of those sought after situations where you can spend 150k over 20 units and raise the rent based on the improvements, and perhaps pull out you equity for the next deal.

Multiple sub contractors with multiple separate contracts are not allowed..Repairs/Improvements must be completed by licensed contractor(s) as required by local/state municipalitiesRepairs cannot be completed by a related or interested party (i.e. relative, real estate agent, seller, broker, etc.)Borrower selects contractorContingency Reserves Minimum 10% is required.

Starting out and looking to continue to improve my process.

You now have the experience of the first house and confidence you can make it work on the next. 

With that said, I know that @Brandon Turner has said (if I remember correctly) on the podcast that he likes to get at least 12% cash on cash return and something like $200+/month in cashflow.In the stock market I am confident in about an 8% return over the long run so I obviously want to get a better return than that if I am going through the work of buying a property and also managing the rental.

Vacancies mostly depend on how improved is the property - condition.

I only have about 15k in savings and didn't see much improvement over the 10 years and would like to start investing into real estate since its a great way to earn cash on cash return. 

This provides another level of confidence in the property management service you are getting.In the past there were instances for which they waived some of the PM fees that were listed in the PM agreement.