There are two main styles of vaping and the style you fit into is down to personal preference.
Mouth to Lung
Mouth to lung vaping is where the vape is drawn into the mouth first and then pulled into the lungs. Vaping devices that are suited to this style have a tighter draw that simulates the drag of a cigarette. They normally also run lower watts as the higher watts are not necessary for mouth to lung style vaping. The advantages of vaping mouth to lung is that the style more closely resembles cigarette smoking so these devices are great for people wanting to swap to vaping but still retain the feeling of inhaling a cigarette. This style is also great if you're wanting to be a little more inconspicuous while you vape as the vapour production is minimal compared to a straight to lung style vape.
For beginner mouth to lung vapers we recommend the Innokin T20 Kit which can be found here
Straight to Lung
Straight to lung vaping has risen in popularity since the invention of electronic cigarettes. Although people do smoke cigarettes straight to lung a straight to lung vape tends to have much more airflow and can produce huge amounts of vapour! Because the devices product more vapour per drag you will need to have lower amounts of nicotine or it will result in a harsh vape. We recommend 6mg nicotine level max for mouth to lung kits. An advantage of straight to lung vape is much better flavour from your tank and massive clouds if that's what you're into!
For beginner straight to lung vapers we recommend the Smok X8 Kit which can be found here.