I want to start a website where many individual users can have private meetings with therapists. I want these consultations to happen within the site rather than externally via Skype, Webex etc. I'd envisage there could be lets say 100 users having 1-2-1 meetings with 100 therapists at any one time, much more if it is successful. I also envisage a therapist providing group classes whereby many users e.g. up to 100 users can join a group clinic with an individual therapist. What software + configuration would you recommend, bearing in mind it should be scalable as I hope my idea will be successful and grow in the future? As this is a startup idea, finance is limited, so if you could estimate cost for website, meeting hosting & integration, that would be great. Many thanks and much appreciate your help & advice.