Some unique ways to source properties are: Through networkingChecking out probate propertiesMarketing like direct mail or online adsSurfing Craiglist AuctionsThe LendingHome Blog has some great articles that dive more into sourcing properties as well.

Many NEW investors have another source of income before they move to investing full time.

My bf has been in construction for 15 years, so I thought he could become a home inspector to save us money, he'd have time to work on our flips, and that could become his main source of income. 

Similar, local realtors, brokers, and PMs sometimes can provide good references.Next you can verify the companies through various sources such as BBB, Yelp, Angies list, etc. 

{Source: Juwai}

If I were considering up rooting.

I don't think I can directly link- but HAPCO is a good source to learn the basics.

That means focusing on sourcing internships/coffee chats/meetings in and with the professionals involved in investment sales, financing, acquisitions, or asset management.

One way to source property managers is to look for comparable properties on apartments.com and from there you can see who the property manager is.

@Odie Ayaga to be honest the entire foreclosure game from sourcing to getting out of the investment...I only say this because I have yet to complete an investment in this area.