Hard to say, as a lot depends on your delivery device. If you want a lot of wattage, clouds and vape, you will likely be using a direct lung, sub0hm vape, usually somewhere in the 3--6 mg/ml suits, I have no idea how much nicotine a hookah delivers, so I might get a bottle of 6 and 0 nic in the same flavor, so you can dilute down 1:1 to 3 m.g. if 6 is too much.
If you are looking for a smaller, less vapor, and mouth to lung vape (similar to the draw of cigarettes) you'd be using less wattage, emitting less vapor, and most folks start somewhere in the 12--36 range (36 really being for a very heavy smoker).
So, depending on what device you want to use, it depends. Just pay attention to symptoms of nicotine overload (queasiness, headaches, dizziness, yawning) and put the vape down if it happens. That should also tell you if your nicotine level is too high. You want to be able to vape enough to put your cravings at bay and in the beginning that sometimes means a bit of chain
vaping, which is absolutely fine to do... at the correct nicotine level.
Best of luck switching to
vaping and I hope it works well for you! Welcome to ECF.
Anna