Welcome. Search. Read. Learn. If you get criticized/corrected, acknowledge it and drive on. A thick skin will help you here and in life.
Remember, there are a lot of professionals here. You may have a lot of questions. Most, if not all have probably been answered. Search before asking and read as much as you can.
Look at people's profiles. Get an idea of who you are talking to before you address them. You called LibraryLady a "ma'am" already, so you are doing better than many others have on their first day...
What else...
Oh yeah, make nice with Free and Pardus. Don't feed the Troll.