Be sure to put your minimum qualifications in a few different places. 

I require:Rent + Monthly Debt Payments <= 45% x Gross Monthly IncomeThis is similar to how mortgage qualifications work.

You should speak with a lender on the qualification thing right away.

We do have a lot of note investor customers, but for now they just use us for initial deal due diligence / qualification.

I am still gathering information on the certifications and qualifications needed but does anyone have any experience or expertise in this field?

They based my qualifications more on my experience and ability to attract high paying rents rather than my DTI, W2 income, etcAlthough with more unfavorable terms (5.5%, 25 year amort, ballon payments, etc) They closed fast and were easy to understand

First time entry level home went from $1000/month to $1900/mo in 3 years and income qualification from $55k to $90k.

Once you file a return that states x% of the property is used for business/rental purposes, you've changed the use/qualification. 

They do allow cash outs, but you have to do a full qualification. 

I would tell the broker/seller that commercial lenders don't offer pre-qualification letters.