Mind you, we have never communicated prior as another one of the investors was dealing with him.If instructions would have been given as a whole, what we were expected to produce verses what they did rather than piece meal it at critical times, there would be no problem and no one would be upset.

I'm on the hudvash program and have been on it successfully for 16 years.

Most DSCR programs will want you to have owned the property for more than 6 months to allow you to use appraised value instead of cost.

There are 30 year fixed options and there are generally programs for 1-4 units and 5-8 units. 

Most are selling hype to get you to buy their programs by deliberately make it sound easy.Your profile here on BP is blank, so guessing you are a "newbie"?

Your interest rate, on a fixed rate loan, should remain unchanged and your mortgage should not be called due.However you should still confirm that this is the case with your lender (and read your mortgage commitment) out of an abundance of caution and because some loans and programs do require a longer seasoning period.

My original plan was to utilize a real estate agent to be my property manager that I met through a Dave Ramsey referral program, but I'm exploring if I should attempt this on my own.  

There are down payment programs for duplexes, i have not searched or tried to do a 3-4 unit property. 

Working with a mortgage broker that specializes in DSCR loans will help you find better rates and programs such as lower DSCR ratios such as a DSCR 1 ratio for better terms versus needing a 1.2 or 1.25 DSCR ratio (more on that below).

Most of these program qualifies borrowers with income and very few DSCR.