First I have a couple of questions for you to really ponder.
1. Why do you think you might want to practice witchcraft?
2. What lead you to this path?
3. What do you expect to gain from it?
If your answer to ANY of these questions is "power", forget it.
READ!!! Find out which denomination you would prefer. You may find your answer in, Buckland's Complete Book of Witchcraft.
I would not bother with any type of initiation or gathering of ritual tools until you find which path you are going to follow. Most tools are not necessary in all denominations. I have much more than most, but then, I have been practicing for a very long time. My particular path essentially needs only a Staff, Dirk (athame) and a Keek-Stane (or crystal ball). Other tools can be acquired as needed.
I am Pecti-Witan (aka Hedge Witch, not Wiccan) a "solitary" practitioner of "the Old Religion", and have been for many, many years. Being a "Witch" is nothing like what is portrayed in movies or on Television. There is nothing flashy about it. we are fairly simple people with "abilities" that everyone has, ours are just honed and utilized. Lots of research and practice. There is a lot to learn when you are dealing with herbal, mineral and candle magick.
I read tarot cards, rune stones and utilize a number of other tools for divination but would NEVER charge anyone for anything I do! Besides, I do not do "readings" or "cast spells" for others on demand. That sounds more like a con game to me! Though I am often asked.
Now as for what I did to start, well, it seemed to come naturally to me, (my mother was a witch and my great grandmother was the daughter of a Comanche medicine man) and I believe this is not my first life (nor the last) as a witch. I have always had a deep respect for nature and have an innate ability to communicate with animals. When I was very young my parents encouraged me to learn about all religions, so I did. And I encourage you to do the same to find your true path. Books are an excellent source, providing you get the right ones, there are some I would avoid (Ravenwolf). I prefer Scott Cunningham. If you can connect with other practitioners that would also be a good way to learn. One question you must ask yourself is are you looking for the structured system of a Coven (are you old enough?) or would you prefer the life as a "Solitary"? Buckland has some very good books outlining both. But my favorite book is still "Wicca, a Guide for the Solitary Practitoner". It is a good place to start (or affirm).
As you have probably noticed, you also have to have a thick skin, because even in this "advanced" civilization there are still those who believe we worship the devil (LMAO), and would rather turn a blind eye to the world around them. Some will even admit that they think we should be burned at the stake! Ignorance knows no bounds.
If you are very young, expect ridicule and really stupid requests to do "Magic" like they do on TV or in movies. It is not going to make you cool. Expect people to tell you that you are going to Hell. You will probably lose friends. Just being honest with you.
I hope you find the answers you were looking for.