Frostino u are the worst flirt i've ever encountered
welcome to the forums Jam Lady, and welcome to vaping as a whole!! Congrats on the switch.
I would recommend buying the same flavor at 0 nic from the vape shop.
In-fact, if you tell them that they recommended 12mg Nic without allowing you to 1st try it while at the shop, they should be giving you the 0mg nicotine for $0usd! But if you're not conflict oriented, def buy the flavor at 0mg.
I'm assuming you know about your e-cig, but I'll try to explain it a bit as well. The Aspire K1 kit came with the Aspire K1 "clearomizer tank" for the atomizer, and an Aspire "Ego style" battery, for your Battery. The battery is 900mAh, I'm guessing. As for your 900mAh battery, it should last you 7-9 hours of constant vape time. That isn't enough for a full day, so you'll need to charge it at some point, if you're vaping like a pack-a-day smoker would. I would recommend you buy a 1000+ mAh battery to go with it. (they're longer, but it's worth the batt life!) Otherwise, you're going to be charging more than you're vaping

lol. As for the K1 ego style battery, it is an "UNregulated" battery... which means, it will start at 4.2 volts and slowly drain to 3.2 volts. The best vape will be from fresh to around 3.7 to 3.5 volts. After that, your vapor will trail-off significantly. IF you would like a battery that STAYS at 4.2 volts, you'll need to buy a "REGULATED" battery. It will STAY at 4.2V til it needs to be charged. Alternatively, you can buy a "Variable-Voltage" regulated battery, and then you can CHOOSE your voltage!! (But this is a whole other can of worms... lol)
As for your Clearomizer Tank (The K1) which is the atomizer thingy that holds your e-liquid, lol... You've got a K1 Clearomizer Tank. These usually come with 1.6 "OHM" coils. The coils wrap around a cotton wick, which soaks up your e-liquid, so the coil can heat-up and vaporize it. IF you are at-all interested in variable-voltage, you will want to head to our variable voltage forum to find out more about "OHMS" and "Coil-RESISTANCE" but for right now, all you need to know, is that YOUR coils are 1.6 ohms, and your battery is 4.2 to 3.2 volts thru-out it's life. Now, "Ohm's Law" dictates, that the "Perfect" vape, is usually somewhere around when your battery's voltage, is just-about 2 or 3x the number of your coil's "ohms" okay? (sry if this is confusing) IF your coils are 1.6ohms (they are) then your best vape, will be around 4.6 to 3.6 volts. So, since your battery is 4.2 volts at full charge, and around 3.2 volts when it stops working, your 1.6 ohm coil is "good" for this unregulated battery. Some would like more power, but, as-long as you are using a high-enough nicotine strength, you will enjoy this combo.
I usually recommend that NEW vapers use 12mg e-liquid, rather than 18 to 24mg e-liquid. A-lot of people are at the camp that believes a "new-vaper/ex-smoker" needs a high nic strength to kick the cigs. I disagree. A new vaper is going to be glued to their vaporizer. It's new, it's fun, it's exciting to quit, and it tastes good, right? So I believe that 12mg is usually perfect for a new vaper that's starting-out on a PV similar to the 1 you purchased. (some new vapers choose ADVANCED PVs, with the capability of choosing your voltage/wattage, and with a "Sub-OHM" coil in their clearomizer tank. This type of set-up demands a LOW mg nicotine, like 4-6mg. But you will be good with a 12mg nicotine, especially if you like "throat hit" which is the kick to your throat we all love so much. You may find yourself going back to 12mg eventually. Until then, just enjoy what works for you!!
If at some point, you decide you want to upgrade to a larger battery size, go with the 1000+ mAh ego battery. If you want to be able to control your voltage for a stronger hit through-out the battery's charge, you can get yourself a "Variable Voltage" ego battery. Just remember what I said about ohms and voltage. (double or triple your voltage, according to the ohms of your current atomizer/tank, and you'll get a great vape!)
Honestly giiiirl, ONE 900mAh battery aint SH*T for a "main PV" lol. I'm just speaking the truth... I definitely recommend you buy yourself another battery, pronto... Get a 1300 or 1400mAh battery. They'll last you 12-14 hours, as-compared to your 7-9 hour 900mAh battery. (Yikes! Idk how I'd make it with ONE 900mAh batt!) loll.
ENJOY your vaping journey, and don't hesitate to ask more questions, either here on the forums, OR, you can always shoot me a Private Message. Just PM me by clicking the name under my little smoking car picture. lol. You should be able to PM me somewhere over there? lol. Have a good day/night and enjoy your new hobby