Good advice. I would suggest when looking for a carrying bag, that you think of it as a backpack that happens to have room for camera equipment. When you're out taking photos you'll appreciate having room for that water bottle.
For tripods, I recommend spending a little more on carbon fiber. The weight difference is worth it. However, tripod is not the first thing you should get. Protect your gear and get extra memory cards before that.
I also recommend checking out Simon De Entremont (sp?) on YouTube. He has great advice for photographers on gear and techniques.
