I wish they wouldn't advertize that way. 1 carto equals more like 3/5 pack. I just switched to vaping pretty recently, and I use 24 mg strength to cover the craving for nicotine. I think you will need something a little stronger to start with.
+1 for Needo's response. I've been vaping almost two months (analog-free, but vaping with analogs for about 3), and when I first started, my little kr808d-1 starter kit came complete with 18mg cartos. I couldn't understand why I just couldn't kick those final few analogs... Until I bumped it up to 24mg. Now, in my final years of smoking I smoked just under a pack of American Spirit blues (full flavored) per day (which have, on average, 1.8mg nic each). I assume that while ULTRA light SHORTS have a decent chunk less nicotine, I doubt that 11mg is enough to satisfy your cravings at this stage. I've only worked myself down to 12mg after being analog-free for just under two months, and I STILL have two 30ml bottles of 18mg e-juice on hand for those especially stressful times.
Now there's two things you should take from this, that the other members have already echoed in some way or another. FIRST, you do not save money at first. And in no way should you feel bad about that (your lungs are thanking you!).
Is this what you are vaping currently? I'm not very experienced with the D1's but I am sure there are members on here who are. I found that the best intermediate mods are the Joye eGo or the E-Power. Did you order it with pre-filled cartos or blanks? Blanks are definitely preferable if you want to save money. With some TLC and routine maintenance, quality cartos can go for quite some time. And blanks are always good for more refills than pre-filled. I'm sure there are some good adapters/extensions out there for you to open up the possibility of other carto connections. MadVapes has loads.
The second point is that a single carto does not equal a pack of cigarettes, as the other members have said. They usually last for as many drags as 5 to 15 regular sized analogs, depending on many factors. If you chainvape (and I definitely did when I started, and still do at times now), it's normal to go through 5 or more cartos a day. This is where re-filling your cartos and looking into mods starts to pay off.
Welcome to the forum and happy vaping, TriciaS. :]