Business 101- find a need, fill a need @Lorien Rollins could probably help you with the basics 

Study landlord basics, especially on what to include in your lease (going forward you will ALWAYS have a written lease).(2.5 Learn from mistakes and don't repeat them.)

I haven’t invested in a property myself but all of my clients are basically investors!

You can basic info on short term rental projections and occupancy rates with a free account, but will have to purchase a membership to get detailed info. 

What they bought was a liability....maybe paying taxes, maybe paying HOA/POA dues, then dividing it between 10 kids when they die, so now really worth nothing, but a headache.#2. 

The word "estoppel" basically means "prevented from saying something different afterwards." 

It will be the fastest way to go from "too young" to "that kid whos crushing it"

Doesn't matter if they have 3 kids or not, if they are late on rent, file notice and if they don't pay...start the eviction.Stick to the facts when you go in front of the judge and you should be fine. 

Don't think it's worth it for 1 property.Vrbo and Airbnb will sync calendars with each other and send basic messages already.Vrbo has free built in pricing tool.

Start by learning basic metrics like cash-on-cash return and cap rate, and check out resources that dive into rental market analysis.