I would recommend exercising from the beginning, and combining that with healthy eating.
The key is to start with a target that is realistic, otherwise there's no way you're going to stick to it.
If you're not very active and have a large appetite, the pretending you'll be able to run a few miles every morning and half your calorie intake is unrealistic.
If you want to get in shape, then I'd suggest starting with some easy targets:
- Reduce the amount of carbs you're eating. Try to cut out bread, rice, and pasta completely.
- A combination of cardio and weight training is the best approach to exercise. Brisk walking or running is good for cardio, the objective is to break a sweat at least once a day.
Purchasing a set of dumbbells and learning how to use them around the house is another good idea.
Weight training burns calories even after you put the dumbbells down, which is why it's a popular option.
Once you're confident that you're getting into a good routine, then try to set new targets and challenges.
Joining a gym would be a great next step, and I'd recommend encouraging a friend to join with you, so that you can motivate each other.
Throughout this regime, do your best to replace unhealthy snacks and sugar-heavy food and drink with natural produce. Fruit and vegetable has to become a large part of your diet, as well as protein and vitamins.