There's just a few things to follow and to keep an eye on.
Considering that this relationship maybe over a long distance the chances of you meeting the other person are almost next to none.
Saying a nice greeting to everyone is the best way to catch someone's attention.
Many of the abbreviations used in chats have pretty much become universal and a lot have become creatively humorous thanks to many regulars in those chat rooms.
But don't let this stop you from keeping in contact of each other.