The same thing happens to me, I suggest consolidating your ideas completely before moving onward. Seeing as how you're planning to make the first...
I haven't really taken the time to read the book, but from what I'm told it is actually entertaining. I'm not really into the whole vampire/modern...
I've always simply brainstormed a character that I could connect with somewhat. Though I would always try and associate them with other characters...
Separate names with a comma.