How Do I Customize the Styles Drop-Down List?

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You need to pass your own style definitions to the CKEDITOR.stylesSet.add function, giving them a unique name, and then configure the editor to use them by setting the stylesSet value.

CKEDITOR.stylesSet.add( 'my_styles',
[
	// Block-level styles
	{ name : 'Blue Title', element : 'h2', styles : { 'color' : 'Blue' } },
	{ name : 'Red Title' , element : 'h3', styles : { 'color' : 'Red' } },

	// Inline styles
	{ name : 'CSS Style', element : 'span', attributes : { 'class' : 'my_style' } },
	{ name : 'Marker: Yellow', element : 'span', styles : { 'background-color' : 'Yellow' } }
]);

Depending on whether your definitions were placed inline or in an external file, you need to set the stylesSet configuration setting accordingly.

// For inline style definition
config.stylesSet = 'my_styles';

// For a definition in an external file
config.stylesSet = 'my_styles:http://www.example.com/styles.js';

For more details on the definition format and best practices on how to customize the styles please refer to the Styles article from the Developer's Guide.