I can imagine Naara not exactly forming a website Taliesin.
I think by offline she means an in-person coven.
You will need to establish what kind of coven you're establishing. The purpose of the coven will attract all of your members. Make sure you have an established way of joining the coven. Covens these days can get tricky to start up. You will probably want legal advisement from a lawyer or something on how people will be joining. It's good to have things secure, and let possible members know everything there is to the coven.
A friend of mine has papers for new members to read through and sign for that sort of thing. She's actually been reported to the police once by parents of a member.
So my advice to you is getting EVERYTHING set up before trying to get anyone to join.
Also, it's good to have a variety of aspects offered for the coven. Lectures, classes, and advisement from leaders. You should find a well equipped building/office for the coven's "home" so the members can easily find their leaders on a regular basis.
Besides that, just be careful with what you say, and teach. A live coven is not as anonymous as a username on the world wide web.