Outdated "getting started" tutorial and asking for suggestions

Well, I was following this “getting started” tutorial but I guess it should be a bit outdated because I cannot see that “Messages” view inside the application (the screenshot in “Step 9: Conclusion”)

So … where is this view right now? And … do you know an alternative “getting started” docu similar to this one that could be helpful?

Thank you all guys and nice to meet you.