The brokerage I work for regularly sells 40-50 off market properties each month and as a new investment consultant, it is my goal to sell at least 3 properties each month. 

How much will that property rent for and what expenses will you regularly incur? 

At what point can I come in and move their stuff into storage (for 30 days) and begin cleaning up the disaster they left?

Yes, he realizes there is a short term opportunity cost in that he could be charging a higher rate to retail customers, but the upside of the profit from the flip or equity in a BRRRR outweighs that.To me if the contractor partner started marking up his labor like a regular job it would be no different that the money partner starting to charge additional interest on they money put in or charging fees for borrowing for other sources.

You shouldn't have any problems finding a regular renter willing to pay market rates. 

I know that that the concept is that I cash out and get the new property…however, since these are regular mortgage loans, how do I qualify for several properties on my salary?

I have been successful finding a handyman and cleaning lady on FB marketplace. 

Depending on the state laws, your tenant may not be able to get rid of his guest at a later date without going through an eviction -- would be good if he knows that ahead of time and has the tools available (ie guest being a subtenant, not a "regular" tenant). 

Screening prospective 'tenants' seems different only because you can have great credit, clean criminal and still be a slob and leave crap everywhere. 

I have been reading that hardwood is not great for kitchens (especially in rentals) because water can ruin hardwood floors, especially if spills/pee/etc. are not quickly cleaned up (a very possible scenario depending on the tenant).