First of all, congratulations on the complete sentences and lack of leet speak - you’re on the right track already. (We likey our spelling and grammar.)
Second, lurk lots, post little. (Here, take my advice, I’m not using it!) Especially until you get the hang of things. We use a lot of dry wit and snark, and lots of newbies try it and hurt themselves, or at least come off looking like assholes. Knowing just how much is appropriate in which forum can be a bit of a trick until you’ve seen it, tried it, stumbled and rubbed your nose in it, apologized for it, and done it again.
No matter how obvious or well known a factoid is, be prepared to go trudging around for a cite. You *will *get called on it. Wikipedia doesn’t count (95% of the time.)
No one ever died from an apology. When you mess up, post something dumb or unsubstantiated or mean or just plain jerkish (and you will, sooner or later, we all do) and someone calls you on it, don’t defend yourself. Apologize and get on with life. No one really tallies the mistakes you sincerely apologize for - but they do remember when you dig yourself deeper and insist on being a jerk.
Some people find religion talk makes them unwelcome, as we do have a higher than normal percentage of agnostics and atheists on the board. I have not personally experienced any hostility. However, I very carefully label anything that is my opinion as my opinion, and I’m not stupid enough to try to convert anyone or “prove” matters of faith. I humbly suggest you do the same, and look forward to chatting with you on such matters in the future. (I’m a Hermetic neopagan, by the way. We have quite a few non-Christians of the religious type on the board, as well as your more mainstream religions.)
Finally, don’t take **lissener **or **Excalibre **too seriously. They like to nip at your heels, but they’re not so bad. They’re sort of like our guard dogs. Pugs, of course. Barks far worse than bites. 
Welcome on board!