Here's my list on top of the obvious request for all current lease agreements.  

Maybe you are able to learn and develop the skills needed to execute effective marketing strategies, find motivated sellers, evaluate properties and what repairs are needed and the costs, structure deals for distressed properties, make effective offers, know how to properly fill out As Is contract, build a buyers list, market property effectively to buyers if wholesaling, negotiate price with buyers, and using the right title company and getting funding to wholesale the property.

Check out Zillow and other property sites to see what is currently listed, what has recently sold (and for how much), and what recent rental units have been leased for.I'd also try to make it out to as many Local Investor Meetups as I can to have conversations with new and experienced investors near you.

If you are interest to read any other of the “How To” posts that I write check out the others listed below.

The agent that helped us purchase the other half of the townhouse called us immediately when the listing came through.

Is there a Realtor "law" that requires a listing agent to submit any offer to the seller?

Are all Flat fee MLS listing companies created equal?

There are the post-closing cleanup, maintenance, and repair issues, as well as on-going problems after the tenant moves in and you receive a “punch list” of whatever else is needed.

If they don't want to leave, list the house for sale and sell it with them in place.

Canadian REI Resources List So BP is amazing but I noticed that all data resources listed are tailored to the US.