I need a Webapp for a Tennis Tournament.

The webapp consists of two functions. The admin function and player function. Flow: On each court there are 2 teams playing against each other. The places are thus determined by the admin. As in other sports events, in this tournament you play the KO'system, with the exception that the losers of the first round come into a separate pot and thus play a 2nd game among themselves, to guarantee that each team plays at least 2 times. -Each game will last a maximum of 35 minutes. Thus a timer must be set for each field. Under each timer a play function to start the game. The view is as follows for the admin and helper:
-with login function -New tournament -Load tournament -Restart tournament New tournament: In this step the data for the tournament are added. The following data are to be determined by the admin: Name of the tournament, number of places, number of helpers. The admin should see or manage the following during a tournament:
-An overview of all teams that remain -Admin should still decide during the tournament if a team is added and make the waiting list adaptable, by drag and drop principle. Example: the first team does not make it in time and so the position of the teams will be able to be changed. -Enable and disable players in a maintenance case The view of the players is set as follows. One logs in and is assigned as a team. During the tournament the following view must be visible: -The next opponent on which court -The last result -If you are eliminated, a thank you for participating will be displayed -An overview of all the teams that will remain As Admin you should be able to change the Upcoming Matches.