@Daniel O.
Hi Dan, I don't have any particular resources on Section 8 rentals but there is a lot of information on the KCHA website. And, contrary to most governmental organizations, I find them to be very responsive when I call with questions or just need information in general. There are a few "Gurus" out there who post free videos/articles on working with Section 8. Sure, it has downsides, but there are many up sides too.
The key is proper tenant screening including thorough checks of the information on their application. Personally, I like working with NGOs who help find housing for those in need because not only do you have the tenant responsible for their portion of the rent, you have both the Housing Authority and the organization to help keep the tenant on track. This is a lot more recourse and much better resources that you'd have if you rent to a qualified tenant from the open market.
What makes you nervous about King County? Or is it the City of Seattle that gives you pause?