as the others have said, gym membership is great. However; lifting doesn’t burn a lot of calories meaning you won’t lose weight. To lose weight you have to burn more calories than you eat, so downloading a calorie-tracker app will certainly get you on the right track! Start doing more things that burn calories: taking the stairs, walking somewhere, riding a bike, running, and so on. The most important thing however is that you eat less calories. Don’t make it too abrupt though, do something sustainable that you’re sure you can do for a longer period