Here's some good reading to get you up to speed on internet forum etiquette. There is much to learn, but it is mostly simple and self-explanatory. Most of us have been on forums for a while, so we know what is expected and what is not tolerated. The best thing for you to do is to read and see what the vibe is here. Don't do anything in a post that you haven't seen someone else do already.
The basic idea is that posts in a thread should stay on topic (i.e., your posts should be responses to the original post or posts after it). If you want to talk about something else, then start a new thread rather than go "off-topic" by "hijacking" a thread. Also, we (generally) do not "flame" each other (write hostile or insulting posts) - although it does happen on occasion (I'm a guilty party on that count...).
We are a friendly bunch here - most other forums are far less tolerant of "beginner mistakes" so don't despair.