I want to create a game world volleyball

i want to create a world bout volleyball, and im setted to do it, but the problem is i dont know how to start, i have the models, and i would like to learn udonsharp, to create, player system for receiving, setting, spiking and blocking, i was thinkin bout questioning here if udonsharp, let you use player contacts to use them to receive spike and block and set, does anyone know if thats is possible, and is there any tutorials that i could watch to go specifically to making this kinda of game?