What juice attachment are you planning to put your juice in? Cartomizer?
If you haven't viewed one yet, search for a You Tube video demo of how to fill your attachment. Then fill as shown. Then...vape.
Slow gentle draws are recommended at first. No hard quick draws. Exhale some of the vape thru your nose to get the most flavor. We also "taste" through our sense of smell.
Drink plenty of water. Vaping can dehydrate you and give you a dry mouth/throat.
Vape as much as you desire or need to. When you feel the need for a cigarette, vape more frequently until the need passes.
It won't be the end of the world if you have an occassional cigarette during your first few days, but do try to resist. Eventually they will become less satisfying, and you will actually prefer the vape over the cigarette.
Don't be afraid to ask additional questions. What strength nicotine is in your juice?
A single coil cartomizer will be less of a drain on your battery, and may also be less harsh on your throat. The resistance ohm rating of the cartomizer can affect how harsh the vapor feels and affects if your vape will be hot, warm, or cooler.