If I publish 2 new chapters and select EA will both those chapters be EA? I just want one to be EA,
Yes, you need to update one by one, so if you have 2 chapters update, but you only want the second one to be on EA, update the story with the first chapter, refresh (sometimes it’s needed, sometimes it’s not) the website, and update the next chapter with EA.
If I have EA and STW selected what happens?
I’m not quite sure, because I avoid adding STW and EA (together at the same time) to not make readers pay gems for just waiting. I prefer to give them extra content so they can spend their gems on that, but if your chapter happens to be EA and STW together, it will be only EA, and then after EA is finished, it will be STW.