Where are the best places (in person or online) to find qualified buyers for investment properties?

You can also check their reviews online at Google, Facebook, or Yelp.

I would start by networking with other investors and asking them for recommendations.Research online for agents that are busy.

You could try your hand at one of the numerous online services that advertise this stuff but I've found it better to start the relationship early with an actual person as opposed to a faceless online service. 

Im currently taking an online masterclass with WREIN.

Thank you JD , as I mentioned I am 1st time home owner and the mistake I did read online about water in basement and I wanted to save my carpets… I think now all of these are wrong fear.

Begin by soaking up knowledge through reading, listening to podcasts, joining online discussions, and getting a real estate license.

Use simple online tools like BiggerPockets to pick apart property details.

We've put feelers out online (like care.com) but haven't received any responses.

I would prefer to go with a established company (rather than an individual hustling on the side) with streamlined processes, transparent online accounting, and a long and strong track record.