Hey anon! pic related taken from UboaChan's FaQ page
has all of the text formatting options available to you. I'm going to eventually add my own FaQ page and/or thread on >>>/meta/ for newfriends.
You're pretty much otherwise using the image board the way its intended, just post images and/or text posts relating to whatever the thread is, and most of all, try to have good convosations and have fun!!