Quote from @Derek Morrison: You can start by researching online.

I’ve been doing that with a few market recently, I try to spend a week just online trying to figure out the different boundaries/different neighborhoods, what the dividing lines are, what type of housing stock is there (I only focus on post ww2 brick for instance) than figure what the yields are in these areas, and then decide if the yields are decent enough on risk adjusted basis to bother to invest.

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.

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. 

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

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.