Tennis is a great form of exercise. You will burn some calories and spent more quickly than other types of exercise. Tennis is a sport that has a learning curve. You can not walk right into it and do it well without learning some of the basics first. Find out what you need to learn to help you play tennis.
Get your basic equipment. This will be your first racket that can be purchased for fairly cheap. Do something that is too good because you'll scratch this one and probably do not really get into the sport. Get a can of balls. One should be enough. Make sure you have comfortable shoes that have a lot of padding.
Learn the basic understanding of the game. Watching it on television and read a little on the internet. This will let you know how the game basically works so that you understand what is going on.
Consider getting a tennis instructor or go to class for a few weeks. Perhaps there is one of these in your area. You will play once or twice a week and began to understand the mechanics of the game. When you do something wrong, you will have some feedback so you can improve yourself.
Tennis is a sport high impact on your joints. Protect them. Get some clothes that fit you. Make sure they are not too loose else this can cause problems.
Find a person or group of people can play with. It's hard to play on your own other than practicing your serve. You need someone to play with others you lose a bit of sport.
Search for the tennis court near you. Go out for this and try to take the game to the people. Many times other players looking for people to play with. If they are more experienced than you, they can show tips to help you learn more.