If you are going to do it under the free trial period, you might as well go pro and plan on filling that puppy up. I don’t think you will have the best results with only 10 attendees.
Sure, you may make some sales, but it is the same amount of work to present to 10 at it is to present to 1000. DO the work once and get paid the most you can buy filling as many seats as you can.
Everyone remember to do some test runs before you start. Sometimes meeting burner has some Java issues. I found it worked better in Firefox than in Chrome.