Hello Michele,
1. Can you set up a conference for a certain time within the set up? -- No, I don't think you can. You can create conferences ahead of when you want to use them and you can added conferences to the calendar as events so students know when they will happen but I don't think you can schedule one to start automatically in the future.
2. Do you have to invite all students in your course or can you just invite one class at a time? How do you do this if it is possible? - You are using the term "class" as though it is a sub-set of a course. Are you referring to sections within a course? If so, unfortunately the answer is no, you can either select all students or uncheck the all students option and then check the individual students you want to add.
3. Is there a way for teachers to write on the white board without using the mouse? -- Unfortunately I cannot answer this one. There isn't a way for me to login into a conference on an iOS device, which would be my only option for testing a stylus. It might be possible on a Bamboo tablet or something similar but I don't have one to test.
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