An on-demand presentation is a pre-recorded webinar which can be viewed by your audience any time they'd like. Unlike webinars, on-demand presentations do not require a large number of internal links.
These paid Q&A webinar sessions can be held weekly or monthly with experts. Leave time for attendees to ask questions to build a quality relationship and fulfill the purpose of your session.
To simply run a webinar, there are options available like GoToWebinar, GatherPlace, Freebinar, WebEx and many more. All you need to do is set a date for the webinar and send invitees a link to a sign-up page.