I have to say for myself that all I could focus on when I first started Weight Watchers was the food and keeping that on track. I don't think I would have done as well if I felt like I had to make it to the gym as well. You didn't put the weight on in a day or a week and you can't turn your entire life around in one day. I make following your daily points your main priority at first since it really is something you will need to work at and figure out how it fits into your life.
80% of weight loss is what you eat, or don't eat
I realize I may be challenged on this but as yourself are you in this for a lifetime or is it just another resolution that you won't have followed through on in a few weeks.
*photo from daily candy