Put out a post on FB, FB marketplace, and craigslist.

We have a PM and communicate wiht them. when we did not have one long ago we did not have any app or anything. we had them pay online or mail a check and put $ in quickbooks and if there was an issue they would call or email us.

This is what Wall Street does to deploy tens of millions into a marketplace quickly. 

@Nigel YarbroughTo find cash buyers and structure a lucrative deal, join local real estate investment groups, contact agents, search public records, attend property auctions, use online platforms, connect with wholesalers, and send direct mail campaigns.

Every system you try will have flaws, or you may salivate over a feature that appears in other software.Some familiar names are mentioned frequently: Stessa, Apartments.com, RentRedi, TenantCloud, Innago, RentManager, Avail, Rentec Direct, Doorloop, etc.I recommend conducting thorough research on each app online to understand their offerings, pricing, etc.

Our market is extremely competitive for rentals and homes for sale  so I will be putting an ad on Marketplace, seeking an investor to purchase a property and lease to them, as they can pay up to 2500 for a 4 bedroom, and more for higher number of rooms. win/win. 

This is because so much new multi family supply has come online.

Sometimes you'll get a different answer than just applying online 2.

I use Focusmate to co-work with others online. 

@Arron Paulino you can find some great information online (youtube) from Pace Morby on this subject.