There is no set list of qualifications. Each tradition expects slightly different things. If you find a teacher, you will be "raised up" in her/his tradition, and she/he will tell you what you are expected to do.
If you are going solitary, that is to say, you don't have a teacher, you will have to decide this for yourself. You don't have to have a teacher, by the way, although it can be nice. Wicca is a Nature religion, and Nature is also our teacher. You can learn a lot by paying attention to the natural world around you, thinking deeply about what you find there, and listening to the voice within. There is a saying that comes from The Charge of the Goddess, which was written by Doreen Valiente. Paraphrased, it goes, "If you can't find what you seek within yourself, you will never find it without." There is a lot of truth in that, and you can often find what you need within yourself.
My suggestions, if you are beginning as a solitary, and many of us did, are to read everything you can get your hands on, but check each thing each author says against your own feelings and instincts. Spend some time every single day outside in the natural world, being still and listening to what Nature has to tell you. Spend some time each day thinking about the God and Goddess, in all their aspects; talking to them, and asking them to help you learn. Keep a journal of everything you learn about the Craft each day, and write something in it every day. Try to look at everything that happens to you as a lesson that you can learn.
If this sounds like a lot of work, well, it is. No one ever said this was an easy path. In many Traditions, they teach that the Wiccans were the clergy of the Pagan world. This may or may not be true, but it is true that most Wiccans wind up teaching sooner or later. I was always told, if it seems like too much work, don't do it! There is no reason you have to be a Witch. You can always just be a Happy Pagan! And it's true, if you just want to worship the Gods and Goddesses, you don't have to be a Witch to do it! You can start calling yourself a Pagan right now, and no one will argue with you, or expect you to be able to do something you may not know how to do.
So think carefully before you decide to take this step. Remember, Once a Witch, always a Witch, not because anyone will force you to keep doing anything in this life, but because you will continue to be drawn back to this path life after life.
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