Please find below links to RFU documents on how to arrange a tour and guidelines that you should follow.
This applies to junior & senior both in this country and abroad. Hope this helps.
General Info: http://www.rfu.com/ManagingRugby/RugbyTours.aspx
Tour checklist: http://www.rfu.com/ManagingRugby/RugbyTours/TouringChecklist.aspx
Tour Insurance: http://www.rfu.com/ManagingRugby/RugbyTours/TourInsurance.aspx
Tour resources & Forms: