I was initially trained in the Oak, Ash, and Thorn Tradition of Wicca back in the 1980's. Oak, Ash, and Thorn, or OATh as we called it, was an oath-bound, initiatory Tradition but also rather eclectic in its practices. The Tradition began in California in the 1960's with roots in British Traditional Wicca, but it had evolved through a stay in New Orleans.
Back in those days it was very difficult to find groups to be part of. The internet had not yet started so it was pretty much a matter of luck to find a good group. I had become acquainted with a lady named Grandmother Owl and very much liked what she had to say, but her group was way to far from me to be reasonable to train with. So she introduced me to the High Priestess of the closer OATh coven. I attended a couple of circles with them and decided that the coven felt very much like family to me. Feeling like family is the most important criteria, in my opinion, of the group for you.
I was eventually initiated into OATh, then later ran a daughter coven named Tangled Moon for some 12 years. I am now the High Priestess of the OATh Tradition with three daughter covens under me.
In 2008, after Tangled Moon was closed because my husband and I relocated, I began my training in a Gardnerian Coven. Gardnerian Wicca is the oldest and original of the Wiccan Traditions, having been founded by Gerald Gardner in the 1940's. I now hold a 3rd Degree initiation in Gardnerian Wicca. Gardnerian Wicca is a very strict Tradition in its practices and it is entirely oath-bound and initiatory.
I compare OATh and Gardnerian Wicca as being like the difference between being a parish priest or being in a cloistered order. In OATh our emphasis was on preparing "caring, competent, Wiccan clergy" to serve in the greater community. After many, many years of such service I felt the need to work more with my personal spiritual life, and that's what Gardnerian Wicca has permitted me to do. In my opinion, there is need for both forms of practice at different times in our lives.
When I started in Wicca no one was "born into it" as Wicca wasn't old enough to be serving a second generation. Further, in the original foms of Wicca no one who was not an adult was even taught that such a thing existed. It was, and still is to some extent, felt that if Wicca was the path for you you would find your own way to it.
These days the vast majority of self-proclaimed Wiccans practice Eclectic Wicca largely based on books they have read. There is nothing at all wrong with that. However, I do feel that there is much to be gained from working with an established coven in an established Tradition. Such things include a magical family, formal training, established practice etc. However, not everyone feels drawn to such a setting, and that's OK too.