I personally wouldn't start advertising a coven in which hasn't been created. This is because, I would personally would like to know what your "coven" is about, what are you aiming for? Expecting members to join a coven in which you haven't created yet, or haven't linked on your advertising, will probably not give you very members interested in joining.
Creating a coven isn't fun and games, you could have fun and you can host little games things, but, there is major work when it comes to running a coven. Knowing stuff is one of the major works as well as knowing when you don't know something. You got to be honest with you members, as well as anyone running in major roles. I wouldn't recommend creating a coven if you are new to magick.