You will need the call number to locate a particular book on the shelves. You will need to use the library catalog to find the call number.
You can search for a book title or author, or you can do a subject search by switching "any field" to "subject" and type "juvenile fiction" or "juvenile nonfiction" and search (note that the subject term juvenile includes both "juvenile" and "young person" sections). This will give you a fairly complete set of results for what is in the youth collection. You can also do a subject search for a particular award such as "Caldecott" to find books that have won the award.