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How to create plugins with the Extbase framework and Fluid templating engine is handled in depth in the chapter Configuring the Plugin in the "Extbase / Fluid book".
There are basically two ways to create plugins in TYPO3:
With the Extbase framework using
configurePlugin()in the file
registerPlugin()in the file
Create a plugin using
Generally speaking, if you already use Extbase, it is good practice to create your plugins using the Extbase framework. This also involves:
creating controller actions
create a domain model and repository (if your plugin requires records that are persisted in the database)
create a view using Fluid templates