If you missed the first part, "Inbound Marketing With Webinars - Production," you can read it here. After you develop your presentation it is very important that you have a promotion plan in place and have given yourself enough time to implement this plan. There are hundreds of ways to market your webinar. As a matter of fact, any and all outbound and inbound marketing tactics can be used, but I’ll focus of a few strategies that have proven successful for me.
I hope the above helps you in promoting your webinars. Depending on your topic you could have 40-50 guests for some and 200+ for others. Over time you'll have a good idea of what topics your audience is interested in.