Hey woodelf :-)
What you get with it depends where you buy it im afraid. The basic "thing" you can buy will be a tank, which is your battery, and a clearomiser which is what your EJuice goes into.
With that, you'll obviously need a charger, either a USB or mains. This may come as a package with the ECig, again, it depends what you buy and from where. You'll also need to buy the EJuice, again, yoour vendor may chuck one in the package for you.
Your clearomiser will be a disposable one, however ive found that by rinsing with water these can last a good couple of weeks, and at only a few quid a go, aren't expensive anyway- most people don't bother cleaning them out, preferring to buy a new one each time, but as im a tight northerner...
Batteries, ive found you'll need at least 2, as logic tells you that you'll need one to vape on as one is charging, especially of you vape constantly like I do. You might other hand find you can manage to wait a few hours whilst yours is charging, again, its a preference thing.
As for what it looks like, hmmm, let me think. They really are all different, colours, weight, size but mine is kinda cigar sized, coloured silver, and obviously heavier than a normal cigarette.