Some Questions About Staffing Agencies

So I've been unemployed for a while, have sent out over a thousand applications, and gotten no response. Been considering using a staffing agency to find permanent work, but I have several questions I want answered before I consider proceeding (This is for the US, BTW):

1: What share of job seekers use staffing agencies to find permanent employment?

2: What are the odds of finding permanent employment the longer one stays with a staffing agency?

3: Should staffing agencies be the first option for someone who is newly unemployed?

Author: GoldenRaysWanderer