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You must specify this directory in Plugin Project > Properties > Build > Output > Outputpath
Plugin.cs
Your Plugin class inPlugin.cs should implement BasePlugin, so it has to implement methods for Install and Uninstall where you have to perform all actions that have to be executed when your plugin gets installed or the action that need to be rolled back during uninstall(Unknown user: Can you please explain what you mean by the sentence in red? Specifically, what do you mean by 'implementing methods for Install and Uninstall?). Typical actions . Typical actions are the initial creation of your plugin settings and the import of language resources.
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