weight loss

I'm 23 and almost 200 lbs at 5'2". I've always had problems with my weight since elementary school. I plan on getting a gym membership next time I get paid. I don't really know what else to do because we have a big family so our food budget is really tight. I want to lose weight so I can keep up with my kids. and ik if I continue down this path ik my health will only go downhill if I keep living this way. if any one has any tips on getting started I'd greatly appreciate it. I need help on how to get rid of my sugar addiction. 🙁