There is no correct way to begin, but a few habits make conversation on Anime AI better almost immediately.
Open with context
Instead of a bare hello, mention where you are in your day. A character can pick up a thread from a single detail.
Say what register you want
Ask for lighter or quieter, shorter replies or longer ones. The character will hold to it.
Build in chapters
If you are writing a story together, end each session with one sentence about where things stand. Next time, that sentence is your opening.
Let silences exist
Not every message needs a question. Some of the best exchanges on Anime AI are simply two observations passed back and forth.