Need support for my tutorial research for App/client

my name is benedetto, im not native english speaker so apologize for my grammar

I would like to use unity for create a mobile app and a pc client which has this features, but I havent found tutorial on youtube and my english competence doesnt allow me to use proper tag for my reasearch

I would like to make this:

an app/client which can:

1)make the possibility to create team ladders and tournaments
2) make the possibility to create a group(team) which can enter in a ladder or tournament
3) create a challenge and post it on the match finder that can be accepted by other teams


oviously I would like to add more features but i would like to start from this, thanks

I really need tutorial because Im very incompetence

discord: RLZ#7403