Congratulations! Your custom search engine is ready to be presented to your users! There are many advanced options and customizations you might want to try out next. Some of it include:
Defining search engines programatically via XML files
Using XML files allow you for more control over your engine than the options available in the Control Panel. For example, you can influence indexing and ranking of the sites, use advanced filtering and sorting and rewrite user queries. You can read more about this feature in the Developer Guide.
Providing Structured Data on your website to enrich user experience
Structured search enables you to drill down into subsets of search results based on the structured data found in your pages. Providing data also allows you to take advantage of custom Rich Snippets in your search results.