You can invoice them monthly and collect like any other vendor. 

@Derek Morrison  Look at multiple vendors and different options. 

Perform the same task in each app to ensure a fair comparison.Load a property with pictures and details.Market that property.See what your marketing looks like from the public's perspective.Submit a fake application to see how easy the process is.Run a credit/screening report on yourself.Enter a maintenance request, assign a vendor, and attach a fake invoice.Enter charges to the tenant's ledger.Enter recurring charges and automatic late fees.Sign documents electronically.Run owner reports.After testing a few apps, one should clearly stand out.

I have a CPA firm I use personally - but I still compile my receipts, and organize them - cost, date, project, purpose, vendor etc.

And keep in mind all affiliated operational expenses such as all the vendors, as those costs go up..... 

Thier vendors are a great resource, and many are happy to give you input when they know you are connected to LU. 

I run a monthly REI Meetup in Niceville, where you can connect with some great local investors and vendors. 

Realistically, if you have a connection to all the vendors necessary and the property is in an area where the quality of tenants will be good, you do not need a PM.

As you talk to more people and educate yourself on the market you'll get a feel for how similar vendors compare and can make a decision on who to hire.  

I go with strictly A+ rated vendors/companies and still check reviews online, but I've found that BBB reviews and ratings are a good indicator of how efficient they are.The 'manage the PM' seems to be a tough reality of the PM industry.