Huh? The use statement is used to import stuff, learn more here https://www.tutorialspoint.com/php7..., a single,instead of multiple use statements.and here https://www.php.net/manual/en/language.namespaces.importing.php
I suggest you to learn coding first... like simple stuff (Join title, small lobby cores) to learn the basics because coding a skywars plugin is not that simple to get coded
I suggest learning how to use this api: https://github.com/thebigsmileXD/gameapi/tree/master/src/xenialdan/gameapi . I suggest starting with this and have created over 5 minigames including Spleef, FFA, my own secret minigames and even tried Skywars. It's good for beginners and once you have read it all, make sure to make your own api or even make the plugin without an api.