Now I have equity locked in and couldn’t qualify for a heloc due to credit as well.

Our debt include only our primary, the duplex, and credit card $3,175.91+$7,317.49+$2,000=$12,493.

Build a strong financial foundation by aiming for a credit score of 700+ and saving for down payments, closing costs, and an emergency fund.

They have credit scores of 760 and 670 and just moved to the US two years ago.

So your thinking when they raise everyone's credit card limit, that people will spend LESS....

I am wondering however if I should transfer the asset to my new LLC and then apply for a HELOC to get a head start on building business credit.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

If you do not have the experience you need the credit, the right deal, and the capital cause chances of you getting max terms on deal 1 are small.I try to explain this to people all the time, it's not just you the borrower, it is the deal too. 

Do some banks or credit unions let you refinance at 90% LTV?

You're definitely on the right track—LoopNet, spreadsheets, and building your team shows you're serious.