Renting to a small business owner

[Tauno Peters]

Aloha,

I have a unit in Oahu Hawaii that some one from another Island applied to rent out. He is going to be living there but not running his business out of the unit. As being self employed he does not have much reported income, he will be using his business to pay for the rent. What are the documents that I should be asking for tax returns, financial statements, what is the best way to verify income? I have not rented to someone that is self employed before any other things to look out for? 

Thanks for any tips