Subject: Your name like: "Introduction TorbenBeta".
The post should be in modern English with understandable syntax and semantic. This is not a live chat so think about what you want to say, how you want to say it and control if everything is written correctly and use enter to avoid wall of texts like Snowdrop is prone to

Try to avoid abbreviations like: "kk is so bb" and if you use one explain it. This is also valid for common English ones like "etc." (et cetera) "e.g." (exempli gratia) and so on.
Not every persons speaks English fluently.
What should be included?
Everything is optional, you do not need to post anything you do not want.
A short introduction-phrase like: "Hey my name is X." or "I'm X." Where X is the name.
From which country you come from so that one knows, "Hey, this guy is from the same place as me."
Maybe your profession to simplify the search for appropriate tasks.
How you came to WT and why and which (tradingcard)games you played.
If anyone has an addition just post it and I will edit the post.
Torben