Start slow. The most important thing you can do is measure your food servings and track them, so you might want to start out focusing on that. Then build on that each week. Perhaps your plan could be something like this.
Week 1- Measure and track food; create Sparkpage and write first blog
Week 2- Walk at least 10 minutes on 3 days; write blog after weighing in. What went right? Wrong?
Week 3- Increase walking to 15 minutes. Add 5 squats 2 times this week.
I strongly encourage you to create your webpage and write a blog. It has multiple benefits including allowing others to personally encourage and support you and the blog lets you reflect back on what went right and wrong.
Relax! This is a learning process and a lifelong endeavor. Let me know if I can help you.