Obviously, there is a spectrum, but those are pretty representative groups. 

On the calls, they only go through Zillow and tell you to scroll and click FAST 😬 and you can find listings by the owner, not a realtor representing the owner.

Generally speaking, the landlord is expected to pay for a leasing commission for both their leasing broker and the broker representing the tenant.

I'd look at land value and land development to capture substantial upside, I'd look at 50+ unit deals for entitlement, I'd self perform land acquisition and land development in a midwest market like columbus that allows for substantial gain and represents a more stable long term growth, but when you break down the industry new construction is very stable you are already doing that by just working in new construction. you'd essentially be the developer on a larger deal you could do that in one deal. lol 

Find an investor-friendly agent in your area — some RE pros specialize in foreclosure, so if after research you're confident that that's the way you want to go, I would find one who can work with you and help guide and represent you in your next transaction. 

Find the elected official that represents your area and contact them.

In fact listing brokers and agents often dreamt of selling their own listing to a buyer that either they found or a buyer who was not “represented” so that could pocket the whole commission.  

Call agents in the area that are listing a renovated house, or call agents who represented a cash buyer on a fixer upper.

I would get a few deals done first with someone representing you to learn the market and buying process before you go out on your own.  

The seller can choose to not have an agent represent them but you can still have an agent represent you.