I'm not new to IP but I'm restarting after a while off. I was not thrilled with the taste of some foods for the first 4 days, but like everyone on here will tell you, your tastes will change. Try a variety and pay attention to the boards, usually the most popular foods are good and well liked by all.
I just discovered the chocolate soy puffs and found my new fav snack. Stick with it-it works! About your leg pains...I recall some weird changes the first time doing this-horrible leg cramps, headaches, strange dreams, perhaps some numbness as well. It will go away, however, you should report all of it to your coach! Make sure you are constantly drinking water, getting enough sea salt and getting some potassium in which could help with some of those symptoms.
Read through the boards, we have some truly inspiring people on here that keep me going daily!
Good luck and welcome to all who are new!