anyone knows about a tutorial or similar to create a simple contacts directory (in spanish if you can :P )
If you want to create a small contacts directory specific to a site you can use the contacts list template and create a list in the site. Here is some guidance.
If your requirement is to create an organization wide directory, it involves a more complex approach. This link might be helpful. In this approach, in a nutshell, all the user profiles in your SharePoint environment are crawled and indexed by the search engine. You use the search webpart and configure it to retrieve the people information from the index.