Whatever system you get, starter kits are generally cheaper than buying everything al a carte. It also removes a lot of confusion for someone who knows little about the different delivery systems.
You may want to think about getting the 1300 mAh battery. In general, every 100 mAh equates to about 1 hour of use, and if you're out of the house for 12 hours a day there is nothing worse than a dead battery. Be aware that a 650 battery will be about 4 inches long before adding a cartomizer and a 1300 will be about twice that. I get about 9 hours of use out of my 650 batteries, but I'm home before it dies and I'm more comfortable with the smaller size.
A kit will come with 2 batteries though, so you could always take both with you.
It's a good idea to buy a second charger, just in case one breaks or dies on you.
Also, if your kit comes with cartomizers, buy a clearomizer or two for your device just to try them out and vice versa.
Also remember these devices are disposable. A battery will last about a year if maintained properly. A cartomizer or clearomizer will last anywhere from a week to a month depending on use.
Expect to use at least 20 ml of juice a week. It may seem like a lot, and you may use much less, but it never hurts to have plenty on hand. Unless you're wanting menthol, try many flavors in the smallest amounts possible until you find something you like.
Nothing is ever going to taste like a cigarette. Ever. You can coke close and find some flavors you enjoy, but you will never find a flavor that tastes like burning plant matter and paper. Know that now so you won't be disappointed later.
Good luck!