.* Get really good at some of the basic appraisal skills, such as filling out a report form, writing up the basic part of a report, researching comps, calculating adjustments, etc.

If it's a strong rental area, as long as you get good tenants to fill the units, that's the key!

I filled the house with bunk beds and rented out beds on month to month to airline crew members.

If you're taking a security deposit, write "N/A" or don't fill it out.

In my local MLS, it may not be true in your area, there is a field that a listing agent can fill out to designate the home they are selling has a FHA, VA or USDA loan which by default would make it assumable.You can also reach out to your favorite local title company and ask if they can provide you with a search tool like TitlePro247 or provide you with a list of current on the market homes with a FHA, VA or USDA loan in place. 

If so, what kind of paperwork is required to fill out.

@Dante Pirouz I found an example of the form online and filled it out with most of the things he had on his list.

In other words the subject property owner's tenants benefit from that property that subject property's owner does not own (and thus pay more in rent, vacancies will be easier to fill, etc).

All units are still filled up.

Yes, you will always find someone to fill and "manage" your property on the low level.