The key to exercising is to find something you will enjoy. Exercise as much as you can comfortably. Do not overdue What causes most people to give up on exercising is boredom and not being able to continue the pace they have set for themselves which may be too high. Start out slow. If you only exercise 15 minutes a day that is 15 more than you would be doing.
Any exercise is better than none.
There are many activities at home you can turn into exercise. For example when doing housework I will turn the stereo up and dance while cleaning the house. Gardening and other forms of yard work is a good form of exercise. And of course always walk if you can. Take the stairs instead of the elevator, park a little farther from the store etc.