Honestly, money is precious when you're on first year pay, don't buy what you won't really need. Your old headset should work fine. Depending on what airline/airplane, you may need a flight bag. You should also have a lunch cooler of some kind because *most* of us bring at least some food along. Some airlines (like mine) make you purchase your own uniform coat or jacket, so you'll need to consider where you might be flying in the winter and what you'll need to buy. None of this stuff needs to actually be purchased before you start ground school, though. Before you run out and buy a new bag, borrow or use an old bag for your first trip so you can evaluate the space your bag is going to have to fit in... I see it most often with new flight attendants, but pilots aren't immune, they buy a new bag and then it doesn't fit in the closet or overhead, which renders it useless. Everyone ends up with a different combination of "kits", because some people seem to need to bring half of their home with them. Start small, you'll figure out pretty quickly what you really need.