If you are actively looking for deals, you’ll probably find several houses along the way that you may not be able to do anything with. You could always refer those people to that agent and the agent could then get new listings.
Get access to the MLS since this is what your cash buyers will use plus I use comps as a negotiation tool since home sellers use zillow/trulia and look at active listing, not SOLDS.
When I started out I was a realtor assistant and had my own access to MLS. I went to networking events and found an investor that was a realtor and they made me their assistant. Now my business partner is a realtor and we both have access.