Using CKBuilder is a recommended solution, however, if you have plugins developed by yourself or by third parties, you can add plugins to your local installation manually by following the steps described below:
Extract the plugin .zip archive.
Copy the plugin files to the plugins folder of your CKEditor installation. Each plugin must be placed in a sub-folder that matches its "technical" name.
For example, the lineheight plugin would be installed into this folder: <CKEditor folder>/plugins/lineheight.
Check and resolve plugin dependencies. If a plugin needs others to work, you will need to add these manually as well.
Enable the plugin. Use the extraPlugins setting to add the plugin to your confiuration:
config.extraPlugins = 'lineheight';
Refer this link for configuring the toolbar: http://docs.ckeditor.com/#!/guide/dev_toolbar