I agree with Rothko. Welcome.
To answer your question about your website listing, let's say that most initial posts that contain a commercial link have been from people whose intention was to promote their business, and not discuss wine. I'll look forward to your participation. One nice way to show your lack of ulterior motive would be to remove the commercial portion of your signature for a little while, become a productive member of the community, and slide it in later on.
Either way, again... welcome!