If you did get results back from your search it is because someone in your class has already run an incremental crawl of the SharePoint farm. If this is the case you can skip the next step series, "Start an incremental crawl".
You can only perform these steps if you have access to your farm's Central Administration site.
If the content source's Status is not Idle, click the Refresh link as described in the next step. Note that in a production site crawls would be scheduled to run periodically and you would not have to manually start them.
If you do not have any results repeat the step series, "Start an incremental crawl".