The official Bulletin #1 for the 1st World Schools Championship of Ultimate is online on the ISF web site: http://www.isfsports.org/sites/default/files/isf_wsc_ultimate_2019_-_bulletin_1.pdf. You can find the main information for organisation and registration.
Registrations are open until November 2018, the 30th and possible only by the School Sports Federation of each country.
You can also find technical rules with this link: http://isfsports.org/system/files/technicalrules_ul.pdf
We are of course available for more information!