First and foremost I would hire a bookkeeper to do this who knows real estate and talk to your accountantbut typically If you have an LLC management company and theY collect the money, and the properties are owned by the LLC, the tenant would pay the Property management company and the property management company would pay the LLC who owns the property.

I've heard of using List Source as a tool to collect addresses of properties. 

If it burned to the ground, they are no longer the owners and cannot collect. 

Look at the landlords that aren't collecting rent due to covid.

I used PMs who collected 10-15% for their services.

Aside from providing the basics (ie. listing tool to get the property published to 10+ major sites, scheduling tool to schedule viewings, tenant screening with comprehensive applications -- pulled reports from TransUnion, which include nationwide criminal background checks + credit checks + eviction history, digital lease creation tool, rent collection tool), automated maintenance tracking is key (and having everything in one spot makes a world of difference when it comes time to have a contractor come in and make a repair).

You've collected a nice savings for your self, use that wisely! 

Did nothing to it, collected rent for that entire time and sold it for 40k.

The big issues are:Lender reserves P&I, T&I this is a new requirement from lenders post covidStay on evictions Recent rent collections Your yr1 projections I would not assume any income growth in yr1.

If you aren't collecting rent, then the PM should not be collecting full fees.