Unsure how to create plugins

[Lncvrt]

I don't really create plugins for under versions 1.8 in spigot api, and I would like to do some custom ones for my server. What API stuff should I do for my project?

[Lncvrt]

Solved by doing this

  <repositories>
    <repository>
      <id>johnymuffin-nexus-releases</id>
      <url>https://repository.johnymuffin.com/repository/maven-public/</url>
      <releases>
        <enabled>true</enabled>
      </releases>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </repository>
  </repositories>

  <dependencies>
      <dependency>
        <groupId>org.bukkit</groupId>
        <artifactId>bukkit</artifactId>
        <version>0.0.1-POSEIDON</version>
        <type>jar</type>
        <scope>provided</scope>
      </dependency>
  </dependencies>