https://www.biggerpockets.com/blog/brrrr-loans-what-are-the-...

I haven't read any books or even online blogs.

I would recommend listening to the BiggerPockets podcast, reading the guides and blogs, or even checking out some of the books they offer there.  

Again, the BiggerPockets store has some books for this or you can learn by watching podcasts, reading blogs, and interacting on the forum.

Once you feel you've built a strong team with your first property and have solid systems in place, I would then start buying more aggressively and taking on bigger projects.I suggest reading this BP article on the core 4.https://www.biggerpockets.com/blog/core-four-real-estate-team

Never try to write or blog while your kids are screaming & running into walls behind you.

two different flavors.https://www.biggerpockets.com/real-estate-investing/house-ha...https://www.biggerpockets.com/blog/live-in-flip

With that, (and regarding your Question #2) I think your expense line items and numbers will run very similar to what can be found in this BP blog: https://www.biggerpockets.com/member-blogs/3915/27972-analyzing-the-financials-of-a-self-storage-facilityYou'll have larger units, which typically means longer length of stay and lower turnover so your management/payroll expense could be lower.

https://www.biggerpockets.com/blog/finding-contractor

Here's a guide that describes what good cash flow looks like and how to analyze a property.https://www.biggerpockets.com/blog/rental-property-cash-flow...