Hud Rental Questions and Advice

[Hunter Beck]

I am looking into a 5 duplex, Hud assisted investment opportunity. It is not a Hud specific home I do not believe, but currently has Hud tenants. I am unfamiliar with Hud housing and would appreciate any advice to some of my questions!

1. What is the process for increasing rents and the government approving tenants for increased rent vouchers? Is this easy or a headache?
2. Can I rent to tenants other than Hud assisted tenants?
3. Are there unexpected fees, red tape, things to be aware of when working with Hud housing that most people overlook? Will renting to Hud tenants affect my taxes at all? 
4. What am I not thinking about that I should be?  

Thanks!
Hunter