The above are great suggestions. After that, you get into stuff you really need to keep around when you are depending on these devices. Like, I order more atomizers when I get down to three...Oh it comes with 2! You might want to have a spare charger. If you use more than one battery a day, you might want another battery in case one dies or gets mangled. For that, I'd get a passthrough battery. You don't need any of this stuff right away but, if you find youself depending on this to keep you from smoking, you need this stuff.