Hey, at least you bothered to ask. Welcome. "The rules" are fairly standard netiquette:
Be nice. You can discuss controversial topics vigorously, but avoid bringing people's sex life, parents, and farm animals into the discussion unnecessarily. The use of "colorful metaphors" is frowned upon.
Try using the search button before posting a new topic. If yours is a commonly-asked question, it may have already been answered. Many times.
When posting a new topic, please put it in the appropriate section so people can find it easily.
Spamming is discouraged, but posting a link to a commercial site that is germane to a thread's topic of discussion or that offers a solution to a question or problem is not a problem. Linking to your own site in your signature is fine as well, unless you are in the adult entertainment industry.
In short, behave like a decent, responsible adult, and you'll not have any problems here, and will likely learn a lot.