I typically host single family homes, but have been asked to potentially host an apartment complex of 22 units.

We get a condo rental in Oceanside typically, and stay for 2 weeks. 

The more properties they get on their marketplace the more money they make so they are basically a glorified MLS because they are marketing themself at a discount to the typical real estate transaction.

I’ve been scanning the market and come to understand as my first investment I’ll probably have to find an apartment/condo something like that and I typically hear of STRs typically making more cash flow etc.

What expenses do tenants typically pay for? 

Typically with houses of this age - you'll need structural folks to dig and install piers into the soil.

Or does anyone have a rule of thumb on how much profit they typically expect to make monthly on a property?

Typically a tax foreclosure is first position lien.

• How do leases typically handle furniture/appliance damage or wear?

EPA violations typically travel with ownership.