Here is my setup. I don't know where you work, but if you're in front of a PC (and for your car), I find that having my eGo pass-thru's batteries are the way to go. That way, if I'm at work, in the car, where ever, I can charge it up if I need to.
If you're not familiar, a pass through is a battery with a USB connection on the end that allows you to vape while the battery charges, or leave it on and it won't drain the battery while you vape.
I already had a USB charger in my car for my phone (the kind you can remove the USB cord), so I just got a cord for the eGo batt that I leave in my car. I have one at work, and at home.
I also do have a little carrying case that I keep a 10 ml bottle of whatever I'm vaping on (keep your old juice bottles, buy in large quantities (juices that you know you like, that is) and fill your older smaller bottles to use while on the go), an extra battery and a carto, for just in case. (I suppose you could actually keep the USB cord in the case as well...hadn't thought of that!)
It can be a little overwhelming at first, because you keep finding yourself in scenario's you hadn't seen coming....but don't worry, this too shall pass. You'll eventually pass the learning curve and move on to the bigger learning curve of trying to figure out exactly what type of device and voltage combo you really like with what juice...THAT's the real hard part, but fun to experiment!
Enjoy!