Yelp is a good source because it lets you read reviews of actual customers.

You will have to source these properties from a wholesaler, where you will have to put down hard non refundable assignment money at the assignment of the contract, or source them yourself.The steps to follow for a subject 2 property are as follows:1.

Can I ask you a software lead sourcing question?

Do you have any pics of some of your favorites (before/afters would be nice).Maybe some curb shots, and an interior rehab your most proud of.Do you self-manage/collect the rents yourself?

It is illegal to discriminate based on "Source of Income" in many locations. 

I consider the two best sources is from other trusted contractors and other RE investors.  

Build - rent - refinance -repeat. in columbus ohio you are buying old houses that are 1900 or 1920 or 1940 and you are in a sellers market. on the other hand you can source land which is a buyers market and build single family homes or duplex or triplexes that will return by renting and pulling cash out on a DSCR loan and doing it again. there aren't a lot of strategies that do this. flipping is different. so many risks. but when someone has a well oiled machine it's all good and less risk.

My favorite source is Navy Federal for its long draw period of 20 years, and Figure for its fast funding.  

@Kenny BaoTypically, larger properties are sourced through brokers.

You could pay the contractors but if you can be a strong referral source I'm sure they'd be happy to give you estimates.