Meeting or Webinar - help please

Hello,

we need to host a remote meeting for up to 100 participants. We are unsure if we need a meeting or a webinar. We have to deliver a lot of important information that all participants must be able to see/hear. We may also have a guest speaker  and wish to show video and photos to all at the meeting. However, it is important that we can have specific times for  Q & A so do not want participants talking over the speaker or each other. 

If possible we would like 2-5 people to be the main Hosts and for all of the attendees to be able to  view the hosts and for the hosts to view all of the participants.

We would also like to use a whiteboard if possible to show documentation to all participants.

I hope this makes sense and appreciate ant feedback on this request.

Thank you.