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Do you mean the number of people that can be connected to the webinar at one time? That depends on the plan you purchase. You can buy a plan for 100, 250, 500, or 3,000 people. See here for details: https://www.gotomeeting.com/webinar/pricing
2. Does it allow breakout rooms?
GoToWebinar does not have breakout rooms. Since GoToWebinar includes a license for GoToMeeting, you could break some people off to a GoToMeeting, and then have everyone return to the GoToWebinar.
3. Does it allow poll questions? if yes, could poll questions be created and prepared before students arrive
You can create up to 20 polls, and you can create them before the start of the webinar. See here: