
Hugs on the R. I'll keep my fingers crossed for your partial.
Starting with dialogue is tricky. You need to identify who is speaking, give a hint of character, setting, and even conflict, all in the first paragraph. It can be done, and when it works, it often works brilliantly.
Donald Maass writes that you shouldn't have lumps of backstory until, oh, a third of the way into the book. Of course you need to weave in backstory, a word here, a line there.
Then again, I just read a book where every time a new character came on stage, the writer stopped the story to give a few paragraphs of largely irrelevant backstory. *I* wanted to throw the book across the room, but she's published several works in the series.
