But what are the actual returns on the investment? 

@Elvon Bowman, Congratulations on taking such a jump.  

The amount of ideologically inspired nonsense online is mind-boggling. 

You do not want to lie on an application, that is mortgage fraud.

Build a strong brand, leverage content marketing, and establish a personal brand to attract investors and build credibility.

Again even if you have great credit as you start to add more credit cards, mortgages, auto loans to your credit you can also be viewed as "High risk" due to Excessive trade lines in credit or higher DTI - debt to income ratios. 

having a HELOC to have an emergency line is smart since if you really need it in a crunch you could draw funds within 1-2 days or less in most cases.

My problem is how to measure if it has any impact on sales price or time on market. 

Are you set on starting with a larger property, or would you be open to beginning with something smaller to build experience?

I have already been fully qualified for both the line of credit and DSCR.