mj2001:
Also, to expedite things, I created a file of character names. It's hard for me to think up decent names while I'm writing the story, so I leave the names as xxx and fill them in afterwards. I've got a list of complete names I've heard/seen that I liked, but I've also got first and last names I can play mix and match with until I find a name I like. I started doing this after I submitted 2 totally unrelated stories the same week and then realized they both had a protagonist named "Maddy."
I too need a file of names, but I tend to list the main characters before I start, adding to that list if I need to. I've found that imdb can be a friend - combine an actress's first name with her character's last name and you've got a combination that fits her ethnic type. Unless it's a scfi or fantasy movie, because "Tanya Grxxx" doesn't fit in most settings.
Writing the spanking itself... It gets repetitive. Sometimes I'll start with where individual smacks are landing, but I can't do that for the entire spanking. Usually, with a right handed spanker and the spankee laying with her face to the left I'll have the first smack land on the right bottom check.
Another difficulty I have is with endings. I often milk the situation, drawing things out, leading to further spankings and reactions to spankings.