THIS IS VERY, VERY IMPORTANT!!!
Seeing as you are brand new to this whole thing, when you go back to Bill's you MUST buy a copy of Michael Martin's book on personal defense and carry!! While a one day course is a good start, you probably are not going to remember all of it, and this book is the most complete one out there, that you can read, AND THEN READ AGAIN!! AND AGAIN A MONTH LATER!! And then refer to regularly after that until you have all the concepts memorized.
The reason is that if TSHTF while you are carrying, there is ONLY time to react, if that, so you need everything that you need to keep yourself alive locked into your head with plenty of range practice to build up your muscle memory. Seriously, this is no small task and is going to take many months to get to the point of really being competent. So buy the book, and then Read The EFFEN Book, and then RRTFB, and RRRTFB!!
Good luck, and learn to look behind you with your peripheral vision...