Moderation is key! Small changes you make each day can really add up to big changes. Sparkpeople is a great way to start tracking what you do each day. I will be honest, there will be days when you mess up or don't feel like doing anything but the key is to learn from your mistakes and start each new day with a clean slate. Remember to make small goals and reward yourself when you reach them.
Instead of thinking of those 70 lbs, make your goal to lose 10 lbs. Once you reach that smaller goal, you will feel accomplished and be more motivated to keep going.
It is okay to enjoy the foods you love but enjoy them in moderation. If you love chocolate, instead of a candy bar try fruit dipped in dark chocolate. It is the small changes that can really add up to lifestyle changes.
Find an exercise that you like to do and you will be more excited to do it each week and get your family involved.
It will be hard but remind yourself why you are doing this and do it to make a better you. Remember Sparkpeople will be here to help you.