If you survive this, read a lot, read the front page.
Learn the rules, written and unwritten.
Post only on existing threads for a while, gain some credibility.
Learn which threads/posters/topics interest you.
Often, there is an existing thread, where your opinion will fit in.
Be prepared to back up your posts with hard facts.
If you state an opinion, mark it so, and explain why you believe it.
Lots of real sharp folks here, learn from them.
Develop a real thick skin, then grow it thicker.
Thanks.