Dude, you don't need to join the gym to lose weight. It's mainly important if you're also looking to increase your basal metabolic rate permanently via muscle growth.
To lose weight from an overall simple outlook, you simply need to burn more calories than you eat. Modify your diet to increase meal frequency and decrease meal size, while also reducing your intake of sugar and saturated fats. Overall, decrease your caloric intake while increasing your activity level. This includes both incidental exercise aswell as intended exercise, such as jogging regimes.
Never fad diet.
Never starve yourself.
Never suddenly go on an extreme regime.
Never completely cut out your favorite foods.
If you do want to gain muscle to help fat burn, then concentrate on heavy weights, low reps. Good muscle overall muscle builders are compound exercises such as bench presses, chinups, pullups, weighted pushups, squats, deadlifts, shoulder presses etc.
Stretch before and after each exercise (but make sure your muscles are already warmed up).
Consume a little bit of sugar and some fast acting protein (e.g protein drinks) after a workout to decrease the state of your body being in a catabolic mode due to the decrease of testosterone (especially true if your workout extends longer than 48min) and the influx of cortisol which tends to reduce your potential results.
Make sure you get lots of protein per day. Around 2.5xYourWeight(kg).