I am curious to know what other marketing websites and strategies you employ when listing your rentals.  

Most of the investors I know have never read a real estate book or listened to a podcast. 

In addition we would like the flexibility for me to be able to supplement my income or leave my employer as we see fit.

here is a good relevant read https://privatesyndication.club/articles/can-an-rv-park-be-a...https://Privatesyndication.club  may be a good resource for you. 

I read one gent saying that his average tenant stayed 18 months, which sounds like a lot of work.  

Dave Ramsey talked a lot about budgeting and when self-employed you’re pulling your business up by the boot straps. initially there’s nothing reliable.

They employ 3rd-party people to handle your property and rarely have a second set of eyes checking for underlying problems.

Once you've re-read what I mean by CPM- who else out there has developed their own CPM, or who else out there sees the need for a separate PM strategy for coliving properties? 

If your student loans are only 3-5% interest, that's pretty good so I think it's okay to pay those off over time.It sounds like you're making good income with your current employer and there is room to grow, so I'd plan to stay with that job until you can pay your high interest loans off and save enough for a down payment for your first property.

You should read Set for Life by Scott Trench.