There are many ways to RP, but here's how I do it.
[message]: I'm saying something
[name]): One of my OCs/characters is taking a "turn"
</[command]>: If I'm roleplaying as Checkball, then I'm using my HOPE to use a command
<[message]>: I'm doing something
*[message]*: Something is happening to you
([message]): I'm whispering something under my.. er... UHHHH...