I've been studying Wicca for 5 months now and there are many people that are newer to Wicca than me. When becoming a Wiccan, you obviously have to study. It's very important to study daily (of course you can't always study-there will be things to hinder your study).
For example, what if someone only studied a few times a month for 12 months and then decided, Hey I've studied so hard! I think I'm going to perform a self dedication rite tomorrow!
First off, if you only study lets say 5 times a month, and you could study more than that, you're obviously not very serious about Wicca now are you? Some people may only be able to study 5 times a month, but that person needs to study longer and harder to reach the final decision of self dedication/initiation.
Secondly, it really takes longer than 12 months of study and learning what you believe in to perform self dedication.
Study and learn all you can about yourself and your beliefs before you even call yourself a Wiccan. You should learn everything you can about the history, beliefs, people (Gerald Gardner, Doreen Valiente, Aleistar Crowley (sp?) etc., traditions, and origins of Wicca.
I will admit that I am guilty of calling myself a Wiccan and I haven't learned everything about Wicca and myself yet. I do however try to fit a minimum of 15 minutes of study a day into my life, and when I'm only able to study for 15 minutes, I make up for it whenever possible.
I hope I've inspired you to try to study daily, or at least whenever you have time to study.
Peace cannot be kept by force but can only be achieved through understanding (Albert Einstein) ~coexist~