Find Brandon's videos on YouTube for the "four square" method of analyzing homes and practice.

You want to make sure your lender understand this as  lot do not and you will waste a lot of time if you are trying to borrow more then what you purchased the house for. 

The upside is that higher rates have taken some of the competition out of the market, and in the event rates lower, you can refi and make a good deal that much better.Having said that, there are plenty of financing options and you should absolutely talk to several local lenders and shop it around.Using an FHA product to purchase a multi-unit where you live in one and rent the other(s) is one way to avoid some of the highest rates (house hacking).

I hope this house eventually stabilizes. 

Same with houses and the MLS.

Sounds like you should go the house hack/FHA route.

But to answer your question, House canary is good for rent rates, zillow is a good tool for property data and for seeing what is for rent for how much, sales comps etc. 

I have a seller who wants to sell a house that is worth roughly $830K. 

I am currently house-hacking and will have an empty room.

In addition, a strong property management company will tackle all aspects of marketing, application, ensuring resident satisfaction, fair housing, handling late payment/evictions, renewals, etc.