If you want to Enable Search facility on your sharepoint 2007 site,follow these steps:
Go to the Site Settings and under Site Administration Click on Seach Visibility Link.
Update the seetings as shown on the attached image.
even after you enable the search visibility on your site and if you start search for a keyword on your site pages it will not work until the Crawling process will be run.
What's the story of Search Crawling in MOSS 2007 ?
There is a Crawling Service running on all Sharepoint conent pages to index all content,if you start your search for a new added content before the crawling process start by including the new content on its schedule,you will not get your search results.
The Question is : How can i Configure My Crawling process on MOSS 2007 ?
Open your central administration site: click on Share Services link under Share Services Administration.
Click on Search Settings -> Content Sources and Crawl Schedules -> Edit the Content Source which is exist.
Update your crawling services as you want and as per your organization needs.
Hope this helps....