Best advice for you that are just starting the quitting route:
Have two of everything. Backups are essential. A couple tanks, couple batteries etc. This way there is never a period of time where your e-cig is down and you have the potential for analog relapse. It happened to me when I started. Only had one pen and one tank and if it was charging I would find myself looking for a smoke. Also, I was smoking a pack a day for the last 2 years and smoking about half a pack a day for 8 years before that. I started out with 24mg of nic. Don't let the store people sell you on "well you smoke X cigs a day thats XXmg of nic so we will start you at that" because more often than not, it wont be enough. Go higher, and ween yourself down. The end game being no nic just flavor down the line or quitting it all together. And dont be afraid to puff on it more than normal if you have a really bad urge. But with a high nic in your flavor you should be able to keep from having urges because you are getting more than enough nic from the e-cig.
UG I never got nauseous when I started. I did however cough when inhaling at the start. This is normal as vapor is different from the cig smoke. Take small hits, mouth to lung until you get used to the way it vapes and grow accustomed to said vapor. After about a week or use you will start coughing. Hacking up nice fat gobs of lung butter. This is also normal as the vapor doesn't kill the cilia in your throat. The cilia is what helps get rid of mucus and dirt from your lungs, and smoking kills them (hence smokers cough). After you have stopped smoking and switched to vaping the cilia will start to regrow and start working to get rid of the mucus they have missed for many many years. THIS IS NORMAL I can't stress that enough. Let the body take its natural healing process. If your throat is getting sore or agitated, cut back on the vaping a wee bit until it feels better. You will cough for the first month, just so you are aware. Again, all normal. Welcome to the vape world! Keep us posted of your progress!!