Considering that this relationship maybe over a long distance the chances of you meeting the other person are almost next to none.
But don't let this stop you from keeping in contact of each other.
Try not to yell, this is where you either type in all capitals or use text editing to increase the font size and bold type of your message.
In IRC's you can only type in all capitals, there is no text editing.
Just keep in mind however that things can happen in a chat just as they do outside. Just as the name implies, cheating can happen on a computer just as in real life.
Just read those stories of married people having affairs on-line.
Again you will have to refer to any instructions that the chat has on posting links. Such a new and wonderful concept, that is until you see the person you're talking to in person! While chatting away you may come across someone who happens to have your same interests.
You can use as many asterixes as you want when typing these out. From hugging an on-line friend to giving someone a cyber-beer to drink.
Also you can use the abbreviations previously mentioned also.
If that doesn't work usually it's best to address someone with a question.
For example, to ask someone a question you may want to use this format to do it and to talk to others the same way: Person's name: Your question Most of the time you will get someone's attention this way.