here’s some videos on using gotowebinar:
http://support.citrixonline.com/en_US/webinar/videos
the marketing/product development, the right way, is more complex.
agree re advance notice is important, at least 2-3 weeks. having a calendar of upcoming webinars, one held every couple of months, is important, on the site, w/different topics. low price is good, $47-$97 range; record them then turn them into downloadable premium/for pay courses for ongoing sales. very successful info-marketing approach if done well, potential to multiply site sales, while delivering more interactive training, like ‘group lessons’.
tip: moderation is important, to avoid problem of 1-2 students asking/dominating w/too many questions (I put a limit of 3-5 questions per person on my webinars, works great, for balanced participation)