Any amount of exercise is better than none. For weight management, it’s best if you do at least 30 minutes of aerobic active each day, if possible. Vary your activity. Try walking, jogging, cycling, dancing, swimming, or anything that keeps you moving.
For strength training, try to aim for two to three 20-30 minute workout sessions per week. Set goals for yourself, and then start slowly (gradually work out longer and harder).