Waiting for players script

Hello! So, I am making a FNAF game, and I wanted a waiting for players scene so everyone can load at the same time. Just like other scary Roblox games. Well, I search YouTube, devforum but no answers on how to make it. And since am kind of a beginner. Am not really sure how to code it.

Are you wanting to make it so that all players must have loaded in for the round to start or just so there are lets say more than 2 people in the game with maybe a 10 second countdown for any slower connections.

I guess you can use a PreloadAsync loop and then tell the server the client is ready after the loop is done, basically the same stuff you find in a loading screen.

how would i set that up? if you could help or send tutorials