The first step is always reporting to your local police department and getting a document that states that any unauthorized visitors will be trespassed immediately-- but in my experience, it takes more than just this to get the squatters out.

Section 8 voucher has income restrictions can be found https://www.huduser.gov/portal....  2nd website you should be exploring PHA website to determines eligibility for the program. 

Websites like LandWatch or Land and Farm can also be good for spotting some options, although off-market deals usually come from direct connections.

The experian website, note sellers list, and data management group all sell lists. 

You can usually find news articles, real estate websites, or government agencies that report annual growth.

@Paul Passafiume have you checked out their website?

The local MLS (Stellar) will syndicate (push) listings out to over 300 different websites depending on your Brokerage's configuration.https://www.stellarmls.com/distribution

@Vincent DeLucia check out our website where we have the entire Metro Detroit area listed by Property Class and the 183 Detroit Neighborhoods.Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.So, when investing in areas they don’t really know, investors should research the different property Class submarkets.

Also you can go to my old website harveyproperty.com or YouTube and watch my videos. 

Just like you I have been thinking into mentorship programs and I have gone to Multifamily Mindset ($40K), Apartment Educators ($20K) which is based in Texas, and now I am looking into RE Mentor (mentor of co-founder of Multifamily Mindset) and it's a 3 day seminar for $1500 (but they end up giving you a *one time discount* if you sign up during the free 2 hour event for $995 but it is possible to sign up for their mentorship program through their website if you can't go to their free event).