Im trying to make a pvp server and I need help setting the spawn. I need to make it so that players spawn at the same place everytime. Currently when players leave and join back the relog at the place they last left. How do I fix that?
Use a plugin for the server.
If the server is vanilla use something like Spigot to get plugins.
Download a plugin like essentials or a spawn plugin. You'll be able to do /setspawn and /spawn (or equivalent) to get to the spawn.
Command Panels, Fully Custom GUIs. You can make GUIs using Custom Software.