You already know how to get data from the database using SELECT, sort it with ORDER BY and choose what to receive with WHERE. You know how to display SQL data in a Web page in fairly simple ways. Here is more on that sort of thing.
Before you start you need to put some data back into the first table in your database. You created this table in the Beginner tutorial but at the end of that you may have done things to the data. You need at least three records (three people) in the table.
If you need to put data back in to the table use PHPMyAdmin and open the ywstutorial database (or whatever one you used). Open the first table and click on the Insert tab.