If you want excellent advice from an agent, you should go to https://www.facebook.com/agentkristin, which is where much of Kristin Nelson’s excellent advice resides. I stopped visiting it for awhile, because early on I sent her one of the most mortifyingly stupid query letters ever written, and I was terrified she might quote it. It featured a small portion of a manuscript that was seriously not completed, despite my unwavering conviction that it was. At times like that, I wish my name were Carol Swenson, because she would forget it sooner. BTW, she was very kind and the form rejection letter did not contain the words ‘mortifyingly stupid.’