If you are new to tennis, you will also need some loose clothing, and good comfortable tennis shoes. Of course you will need a racquet, large and light is easiest to use. Talk to an expert before buying one. A good racquet may cost $100 or so, but it’s worth the money, if it helps you hit the ball more often!
Now, its now where near as easy as it sounds! Amongst other things, you need to learn a good swing pattern, and a coach is the best way to learn this, and all the other things that will get you off to a good start, and stand you in good stead throughout your tennis lifetime.
I first started playing tennis when I was 15, because thats where the girls hungout, and while it didn't do me any good in that respect, tennis did give me much pleasure, and lots of fun in later years.
Happy tennis!