Have anyone used business credit to fund their deals?

Is it possible to get a rehab loan on my property if my credit score is 534?

Try to keep your credit above 740 to receive the best rates.3.

I am also in the process of getting a business line for credit from my credit union.  

I have an 800 credit score with no credit card debt, however I am self employed and on paper my wife and Its shows we don’t make much, I think after taxes it was about 25k last year.

I've been focusing the money that I would be using for investing to pay off credit cards from school as I graduated 8 - 9 months ago and have been working as a Software Developer ever since.

The "slumlords" can make good money but they also risk more potentially with the type of tenants they attract (low credit scores, section 8, etc.).

Before accepting a tenant you should screen them properly such as verifying employment, credit, clean background.

I have good credit, debt-income ratio, and could come up with 10% down if needed, 5% preferred. 

The issue is that I won't qualify for financing at a traditional bank any time soon as I work on my business and credit.