Congrats on the job! Make sure you vape yourself or can answer some of the common questions people might ask, such as:
* What nicotine level should I buy? I used to smoke (this amount) of (lights, regulars, unfiltered).
* About how long will this battery last for?
* How long will it take for the battery to charge?
Know what juices you sell that are going to make people happy with a standard (non-adjustable voltage) starter kit. Be sure to warn people that some (darker colored / more VG) juices will wear things out faster. Make sure you tell people that the plastic in clear tanks and clearomizers can be damaged by essential oil / citrus flavors. Know which one of your products might damage these things.
Explain to everyone new the importance of having at least 2 batts, and attys / cartomizers. Explain that it might seem more expensive at first, but it is super easy in the beginning to have a battery run out or an atty die and then end up buying a pack of cigs. I woudn't push this on people, but simply explaining it in a friendly manner should help you increase sales and is good for the new customer.
Make sure you show all the new people how to use the equipment they purchase. Show them how to charge, fill, and assemble everything. Yes, this takes time. Yes, other customers might be waiting. But you are forging a relationship with these new customers that will bring them back into your store in the future.
Be sure to explain why most experienced users don't use cig-a-likes. In addition to all of the standard answers, I personally found that still wanted to smoke analogues with them. Now that I have an eGo I don't crave analogues at all. I actually have half a pack of my all time favorite analogue (The unfiltered Galouise Brunes, previously called Caporal) sitting in a drawer that someone gave me as a gift. I'm going to start giving them away to people, because I don't want to smoke them anymore.
If a customer has a question, and you can't answer it. Don't try to answer. Tell them it is a very good question, get their contact information, and ask the forums. Once you have the answer, call the customer back.