Gather about you symbols for Air, Fire, Water and Earth, to represent the balance of nature. Since the elements are already all around us, you can use whatever is handy, such as incense or a feather for air, a candle or an electric light for fire, a water dish or a picture of the ocean for water, salt or some backyard soil for earth. (If safety is an issue, you don't need to use real fire to represent fire.)
Traditionally we place Air in the east, Fire in the south, Water in the west and Earth in the north. You can, however, put them where you want to, so long as it feels balanced. You can also add statues, pictures, flowers, poems or just about anything else that has spiritual meaning for you.
Then either walk or swing your arm around in a deosil (clockwise) circle three times and say or think "thrice I cast this circle 'round, sacred is this holy ground." This is how you close a circle, creating a magical working area, which we call A World Between Worlds. It puts you in a separate place from your surroundings, yet also recognizes that all "places" on Mother Earth are sacred.
Then ask the Gods to listen to your dedication (don't worry, they'll hear you.) Read out a statement in your own words that you wish to study Wicca, why you wish to do so, and that you promise to follow the Rede. When you're finished, thank the Gods for their presence. Then open the circle by going three times widdershins (counterclockwise). This returns both you and your working area back to the "mundane" world.
Now you're a formal student of Wicca, learning in your own way, at your own pace. Some people study Wicca by reading and practicing alone, some by working with teachers, some by having experienced friends and some by combinations of the above. Do what's best for you.
If you have an interest in other religions, you can still attend Christian or other services, explore different faiths or even join other churches and still be a Wiccan. You can also stop studying Wicca anytime you wish. You're always the master of your own soul.
Some teachers have been known to charge a fee for formal classes in Wicca, and I won't pre-judge them, but some of us old-timers believe that the wisdom of the Gods should be shared freely, and that the honor of passing the flame to another seeker is the greatest reward that any Wiccan can receive.
Suggested free e-books to read:
Anonymous - Reaching Out To WiccansEverfool - You Know You Are A Chaote When