There are several really good things someone can do to prepare for the first day of working out. Have a plan.
1. Decide what you are going to do during your workout. The best workout plan is a workout plan that incorporates the things you currently enjoy or something from your past (maybe when you were a child) that you had fun with. If your workout plan includes those elements it will help you keep motivated to continue exercising.
2. Decide where and when you are going to do your workout.
3. Put your workout in your schedule just like any other appointment.
4. Prepare your workout clothes the night before. An option also might be to find someone else to workout with.