Welcome to OCDO.
Bend over, put your head between your legs, look up and kiss that round part goodbye, as you are about to get dogpiled. Even though the search function is wonky at best, even a newbie might think to use it before posing a question as basic as yours. The issue has been discussed so much that whenever it comes up we all chant the answer, in unison, like a Greek chorus. Sometimes it is downright scary.
You should at least have a basic understanding of your local laws when you begin carrying. There's no need to take a concealed carry class to learn them. You can select from a number of classes that the NRA offers http://www.nrainstructors.org/searchcourse.aspx that will cover the matter and still not qualify you for a concealed carry permission slip.
PS - "When you are in imminent danger of death or serious/grevious bodily injury [and, if your state requires it, you have met the duty to retreat and stll are in imminent danger]."
And we only shoot to stop the threat, not to wound or kill or scare them (warning shot).
Learn the 4 Rules http://www.thegunzone.com/therules.html or http://www.corneredcat.com/article/f...he-four-rules/ or in the original http://thefiringline.com/Misc/safetyrules.html Here's a poster you can print off http://mondaynightshootingleague.org...earmSafety.pdf