By default, and "pages" you create should show up next to the "home" tab. If you want more control over what goes up there, or the order, or if you want custom links up there, then you will want to create a custom menu where you have complete control.
As far as a tutorial, you can check the theme designer's website and see what is over there, but there isn't anything here at wordpress.com. Also keep in mind that themes here are sometimes modified from their original so some features in the original design may not be in the version here, and there even could be things here that aren't in the original design.
Part of what you are paying for when you buy a premium theme is direct access to the theme team and the theme designer, and you get that in the premium support forum. You can find a link to it (have to be signed in under the username that bought the theme) by going to appearance > themes and at the top where it shows the theme you are using, there will be a link to the premium support forum.