How would I go about making a Matchmaking system?

Hi scripting community,

so I'm trying to implement a cross-server matchmaking system in a game i'm working on. I just got 2 weeks of experience scripting and this is getting confusing. I googled a lot of topics but I'm stuck on getting 1 "host" server that handles the matchmaking requests. I tried it with MessagingService and JobIDs but I couldn't get 1 main JobID and then I have another struggle how would I go about and reassign a new server as host if the host server stopped/dissapeared.

Thank you