want to start writing spanking Fiction
 

Okay, so I am used to writing some rather long stories on other websites, such as Fanfiction.net, AO3, and Wattpad. However, I have never written a story that strictly focused on Spanking (though there are some scenes in my regular works) so any advice on how to write spanking works for this site?

Just dive in. Either create your own original characters and universe or start a fan fic. Write about whichever interests you the most and go from there. I haven't read any of your work so it is difficult to say what you need to do or shouldn't do. Just have fun though.