I was talking to someone at school to have a room available for the Muslims at the school to pray. The time they would let us pray would probably be an hour after the time for Salah. Is this okay? Are there any other requirements we need to put in place?
I am not a mujtahid or faqih, but personally I would say that if this is what you can achieve under the circumstances, and this is what the school will allow, then that is an achievement. Many people pray one hour after awwal al-waqt (the first moment prayer comes in) without even thinking about it too much. If the school can gradually, and in a friendly way, be persuaded to allow you to pray at awwal al-waqt, then that will be even better. Maybe you can in a friendly way say "Thank you" for their accommodation, and that if they can manage to allow you to pray on time, then that would be even better, and if they can't manage that for you for now, hopefully in the future maybe they can.
If you make the room a beautiful place to pray in, and also keep it clean and tidy, that will go some way to making them more favourable towards what you need inshaAllah.