Here's a method I have used to scan my comic line art since around 2005. I can't recall exactly where I learned this technique, but at the time I confirmed that it was standard practice by a couple of other professional comic artists.

This is a question dreaded by anyone doing creative work, as usually, the first truthful answer is, "I don't know". I have also previously said that looking for ideas is like asking your brain please and it eventually comes up with the goods...Which in short just means, keep asking questions and eventually answers, or at least parts or answers will come.