You can use there history and credibility since you will be assigning properties to them to close.First step is to make sure you understand the laws in your area regarding wholesaling which is the assignment of a contract and double closes.

The tenant to provide a copy of the pet's vaccination records, medical history, and vet's name/contact information.  

Also, I highly doubt banks will give you 10 mortgages with your history. 

What qualifications should I be looking for aside from credit history?

New electronic timeline tracks bridge jobs, historyA new electronic timeline of the Gordie Howe International Bridge tracks both hiring for the $5.7-billion planned crossing and the history of the project.It's interesting how quickly we forget about major catalysts when they stop being posted in the news all the time.  

There is a long history of people creating "illegal" basement apartments.

I use their screening service to screen potential tenants and their reports are thorough including credit, income identification, criminal record and rental history.

Obviously credit is poor otherwise traditional mortgages would be used, so is it more based on income and work history?

I sent them the appraisal I completed and the VA appraiser basically tore it to shreds as if someone was challenging his authority.

You'll need a Purchase and Sale agreement, Authorization to Release Information (to contact the bank, etc.) to do a title search, and definitely know the local "case law, on the books," so utilize a good RE attorney, who SPECIALIZES in these deals.