When should I exercise? Morning, noon or night?

There's no actual better time to exercise, you can exercise at anytime of the day that you prefer. Exercising in the morning can be a great way of starting the day as you get the heart pumping and blood circulating through your body after having spent a few hours asleep with no activity. And it also gets exercising of your to-do list for the day. It takes away the chance for you to "put it off for later". Exercising in the afternoon could be very hot and you have to make sure you're even more properly hydrated because of the heat. My favorite time to exercise is at night as it's not so hot. But anytime of the day is a great time to exercise.

How do I have a healthy lifestyle?

A healthy lifestyle is something that definitely can't be forced. You can be successful at it for awhile if you force it, but in a lot of cases, you'll end up back where you started. You can start by taking walks and gradually build it up to a regular exercise routine, after you stick to your exercise routine for awhile, you'll realize some pretty big changes in yourself. You'll naturally have less of an urge to eat stuff like chips and even soft drinks, instead your body will crave healthy stuff like vegetables and water. A diet plan in that sense is not even necessary as you'll be more in tune with your body and you'll naturally be consuming healthier food. But if having a diet plan is a must for you then add the diet in after having stuck to your exercise routine for at least two weeks. Never do it all together or it might be too tough to maintain. A healthier you is a process that should be gradual so that it can be maintained.