Country
Language
For the busy periods the rule is: the sooner the better, because otherwise the coaches are gone. Which periods those are is in the guide on how far in advance to book.
Yes. Everyone travelling needs a seat, except the driver. A group of forty-eight children with four supervisors needs a coach for fifty-two.
Yes, you enter that as a stop in your request. Do it in one request, not two, otherwise the coach company will charge for coming out twice.
Request for the number you expect now and pass it on as soon as it's fixed. You can change your trip details yourself on your overview as long as there's no confirmed booking yet.
Fill in your place of departure, your destination and your group, and compare the coach companies with their prices.