The long answer is to create a webinar program that you can sell. You start with a lead magnet and a video that invites folks to your free webinar. During that free webinar you sell your webinar program/content. That is the going solution, but there are many others out there. But you may already know that. :) or, you can place your knowledge into a book. Whether in print or ebook form. You can create ancillary products from that. My team assists with the latter path. Best to you!