Going forward, should I have a separate credit card for each of my properties?

Here is my question: Should we take out a HELOC (home equity line of credit) or a home equity loan on our existing SFR home (that is paid off) to finance a 10% down payment on the new investment's mortgage? 

Good afternoon,I have clients that are currently interested in a triplex property and qualify without an issue but the property itself does not pass the FHA self-sufficiency test without one of the unit’s income, since it has to be owner occupied for FHA due to one of my clients having a foreclosure on their credit that won't be removed until March of next year.

I've got excellent credit, a flip, and 4 rental units (in the past three years). 

I've got excellent credit, a flip, and 4 rental units (in the past three years). 

I also believe there are lots of videos on YouTube, some selling products, but many just offering guidance on things that they have tried and worked or didn't work.  

Curious to know if there are any good loan options )other than hard or private) that self employed people can use with little to no taxable income.

Min 2 year credit history as a professional unless you are a physician.

Curious to know if there are any good loan options (other than hard or private) that self employed people can use with little to no taxable income.

You’ll need money, credit, and a team.