Pre-planning for tomorrow

I hope to actually plan my meals for tomorrow.  I planned after the fact which would not go a long ways into helping me to lose weight.  I have gained some weight since last week.  I have not eaten a healthy breakfast. In fact the only thing that was even close to being healthy was the baked spaghetti casserole but the added cheese made it unhealthy.  What I need to do is to pre-plan BEFORE I go to bed late at night tonight, then actually follow that plan, to the letter.  I tend to change my mind often, which would go a long way into ruining the plan that I had for the next day.