Hey I'm a (Wade) Robson fan too.
Actually I've been a tennis camp instructor so lucky for you.
1. For a beginner buy an oversized racket, the biggest one you can afford. The more surface area to your racket the easier it is for you to hit the ball. Buy from a tennis shop or sporting goods store so someone can find you the right grip size instead of going to department stores which usually carry cheap quality rackets. Look into buying a used racket.
2. To learn tennis on your own you can go to the public library and check out some tennis instruction books and practice hours by yourself against a wall, like at a concrete racquetball court at a high school.
3. The best thing for a beginner is to take a private lesson from a USTA pro at a park or country club. Learning tennis on your own leads to many bad habits and incorrect forms that may be hard to undo later on. Instead of experiencing all the wrong ways to do things on your own and getting frustrated it's better to let a pro teach you the right way from the start. If you can't afford a pro see if you can find a high school tennis coach or player to give you lessons.
4. Check with your high school. Some have team workouts/practices or tennis camps over the summer.
5. Most important thing to focus on is using the right technique. Results will follow later. Your technique, using the right form will kinda set your ceiling of how good you can become in the future.