Help! i need to lose weight, any tips?

my doctor says that i am morbidly obese and that i need to lose weight or its going to cause major problems when im older. im 16 years old, 17 in JAN and im 17 stone 10 pounds (i know, bad right? but i comfort eat) i have a wii fit, just dance a dance mat and a exorcises bike, but it is the motivation that is stopping me and im also im weight waters diet but its just not doing anything. i need help with meals and routine exorcises so that i am able to have a better life!! PLEASE HELP!!