You should get a new tool for every house.

A popular strategy is to select a couple of units that are the most under market and issue those termination notices. 

I figured that if I needed somewhere to live then I might as well use it as a learning tool and project.

For that reason I highly suggest the following books,Rich Dad, Poor DadSecrets of the Millionaire Mind7 Habits of Highly Effective PeopleHow to Win Friends and Influence PeopleThese are all wildly popular books and you should be able to pick them up at your local library. 

With the tightening of lending requirements, seller financing (creating notes) will probably be a popular option as well.

At first glance, there seems to a decent amount of value in several of the items... everything from 3 old Cadillacs that are in bad shape to old computer hardware, music equipment, power tools, hand tools, likely some antiques, etc. 

Having your license opens many doors that you wouldn't otherwise have such as earning referrals, gaining access to real estate tools that you may not be able to without a license, and you can become a trusted resource by obtaining other certifications that are only available with a license.

 So far,  it had been a good tool for tax deductions.

BP has various tools available to help you analyze your deals (rental, flips, wholesale, etc), feel free to use them: https://www.biggerpockets.com/investment-calculators 7.

I see flex schedules with a hybrid model of office/WFH becoming more popular.