Hi and welcome to the board, I would say that you will experience emotional withdrawal for a few weeks as your mind and body retrain themselves to the new you. Gum does not contain the same amount of nicotine in cigarettes so you will naturally feel some withdrawal for a little while as your body adjusts. The gum will initially take the edge off for you so you can get through the first week of cravings.
Drink plenty of water as this helps the body flush the 4,000+ chemicals out of your body and also if you get a craving to smoke do deep breathing and change your activity and the craving should pass after a few minutes tops.
About 4 years ago I tried nicotine gum and I stopped smoking for 58 days. I failed after the gum ran out and you know why?? Because I never read anything. I had no knowledge from forums or websites. You need to treat your quit with your life and make your desire to quit is stronger than your desire to smoke, that is how you will win.
Visit whyquit.com and read as much as you can as knowledge will help you overcome this. This board has a package for new people to read and also please post here when you need someone. There are many great people here who can help you in various ways through knowledge and experience. Good luck