You could offer listing service for them.

Yes use a servicer like FCI or Madison management or others.

Some folks pull out capital to deploy into other investments they see as a good move, but you may also want to consider the capex and debt service the property comes with as far as gross rent covering the costs.

I use Advanta IRA and have been happy with the level of service that they provide.  

Should I offer to pay them for their consultation, or are these types of questions common as part of the PM vetting process and is a "courtesy service"?

Its a per-service fee. 

Quote from @Zhongyuan Luo: Hi there, I have a general question as I’m considering going pro with the service.

Some employers, (when you're 50+) 401k adoption agreements will allow you to do an "in-service-rollover". 

They are communicating with the Asset Manager and the Field Service Manager. 

Used a HELOC on a primary, and was sure that even with that additional debt-service, there was + cash flow.