The emote commands are given in /emotelist when you hover over each emote.

If you're unsure of a command and don't want to search a list for it, what you can do is type slash followed by part of what you think the command might be, or what you want to do, then hit tab to see if there are any autocomplete results. For example, if you want to toggle sound effects, you might type /sound[tab], which gives /soundeffects, /soundeffectsother, /soundefffectparty, /soundeffectsself. If the command you want doesn't stick out as obvious, then you can check what each one does with /? (in the chat box, not the macro window) (this also accepts auto-translate phrases as arguments).

A vast majority of the game's slash commands are literally just slash followed by what you want to do, so this method should yield the right command in most cases. If it doesn't, you probably just need to reword what you want to do.