I feel somewhat uncomfortable with the fact of multiple people being responsible for the rent with no true tie to each other.

The reason being you would either not qualify for good financing or you would feel uncomfortable with the monthly holding costs/reserves need for the property.

Our class D units routinely pass inspection, because we know what the inspector is looking for (grounded outlets, no chipped or peeling paint anywhere, etc.)But a voucher is for a single unit. 

1) how to do this2) what is the daily routine for full-time investor3) what education, courses, books, and experience require this4) can I have a mentor for this4) any further adviceP.S I am currently a part-time investor since 2012, it was an adequate experience.

I'm not suggesting you shouldn't read and review it carefully, but as long as the type of representation, commission, listing start and end date, and any cancellation penalties are what you agreed upon, the rest is likely pretty routine.

This is all pretty normal and routine stuff. 

I’m seventeen, work at dunkin, and I see room for a business that takes care of routine cleaning so inspection season isn’t such a freak out.

Pay off that debt until the amount of cash left in the bank makes you uncomfortable.

Even worse if she had addictions like shopping or gambling.A problem would be if you invested and she wanted to sell and give up the first time you had any problem that investors routinely or predictably will have (if they invest long term) like tenant damage or unanticipated construction.  

However, if the tenant is paying $1000/month as a monthly rent payment then advertising the gross rent of $1000 isn't technically wrong.I've ran into a lot of weird undisclosed stuff in leases like landlord supplied utilities and internet, incorrect rent amounts, landlord paid routine maintenance, etc.