In reply to toddR:
Get a technical advisor (MIA or above theres loads about have a look on
http://www.mountain-training.org/) They will be very useful and can come up with some site specific training for your staff or get your staff qualed if any are keen indoor climbers, but consider getting some freelance instructors in (your Tech A can help there) once the kids start to progress.
https://www.thebmc.co.uk/information-for-wall-managers?s=1 This has some useful info.
Where abouts in the UK are you?
I've been setting for a school down south east recently. Close co-operation between the school and the setters is vital.
Get some quality Route setters and do it as regularly as you can, change helps. But don't go getting pro climbers to set, they're good at hard routes but not so good imo at easier routes. Get a pro Route setter who has experience with setting for schools. Or speak to your nearest wall.
Have a look here for setters in the area:
https://www.routesettingassociation.org/
Have a chat with Nate from CWS his company does a lot of setting and runs good training course:
https://climbingwallservices.com/
Feel free to message me on here for further info.