I really want to lose 20 pounds and chnage myself. where do i start?

Good for you.: For most people - a goal of 1 to 2 pounds per week is fine. Eat healthfully ; be physically active. Aim for 7.5 to 8 hrs of sleep / night. Hydrate w at least 64 oz of water / day. Calories burned must > calories consumed. Do both cardio ; weight training. You can mix ; match different kinds of physical exercise. This site helps determine calories burned for > 100 activities:.