Hi Adsta
the Atomizer is basically a tank in which u put your juice and when u press a button on your battery it atomizes the juice into vaper.
There are different types, most beginners kits will have clearomisers (clearos)in them (a clear tank).
On some like the CE4, CE5 etc, u can fill from the top by pulling/unscrewing the mouth piece. These have a top coil and u can see the cotton wick hanging inside the tank.
On bottom coil clearos, u have to unscrew the bottom to fill them.
Have a look on youtube for CE5/stardust clearomiser review, or for a bottom coil clearo try searching for Evod review.
A 650mAh battery should last you most of the day, so its nice to have a spare battery as they can take upto 3hrs to recharge.
Its a pretty good kit and reasonably priced. Have u got a link just so we can ahve a look?
Also here is another good starter kit, its an Evod kit for £29 + postage.
Kit Contents
2 x EVOD Manual battery (Constant output voltage:3.7v; Capacity:650mAh)
2 x EVOD 1.5ml Clearomizers (Resistance:2.5ohm)
5 x Bottom Coil Heads (Resistance:2.5ohm)
1 x 500mA eGo Fast USB Charger
1 x Uk wall plug adapter
1 x User Manual
1 x gift box
http://myepack.co.uk/kits/evod-starter-kit.html
also here is a good video explaining all the terminology, kits etc...
http://www.youtube.com/watch?v=cMjrsko_7Ps&feature=c4-overview-vl&list=PLDgougYzWLsWHjTe0wnzZSTt2j_c1-Ab7