I plan on doing some on my credit line and the rest on HELOC loan.

@John MasonNot a fan of velocity banking as proper will charge $ o make it but typically it’s better to invest this money- here is what makes me laugh in this articleIf you do velocity banking you pay it off in 76 months - if not you pay it off in 77 monthsIs all that work of trying to write checks from a HELOC vs auto debit your bills worth one month of mortgage payment over 6 years?

In this particular case, I have a property I'd like to get a HELOC on to then buy another property.

Hello, I am new to this space but was looking for some advice on obtaining a HELOC on a home that I am currently renting out. 

I would close in cash/with a HELOC and then do a refi with a hard money loan.

I've made some foundational moves (heloc, llc, etc.)  

I would suggest you consider the following ideas:- Can you put a HELOC on your primary house and pull out some cash ($100-300k) in funds to invest in BRRRR properties?

I'm seeking advice on the best way to pay off or pay down my HELOC.

Additional Thought - Would a line of credit/heloc against the equity be a possibility?

Make sure you know the value the ADU will add to the property before building the ADU. 2) the financing on an ADU is typically far worse than for initial investment property acquisition or is often not leveraged by the ADU (HELOC, cash out refi, etc).