Huge fan here.
I agree about not writing anything unless you are ready to. What helped me was to imagine what I would be feeling like with 40 lbs or so gone. Then I wrote my 90 day goal based on that. For daily goals, it is kind of a personal thing - whatever you are having trouble doing. For me, one daily goal is to drink all my water (hard for me!) and I phrased it like this: "I feel SO much better now that I am giving my body all the water it needs and flushing all the fat and toxins out of my body." Tried to make all my goals in the present tense and focus on how it felt.
Hope that helps a little!