The UI for Sketch recently changed because we added layer support and, unfortunately, the tutorials haven't caught up yet. There are two things that I think will be helpful for you:
1. This step-by-step walkthrough of some of the basic features and functions in Sketch: https://helpx.adobe.com/mobile-apps/how-to/digital-painting-drawing-photoshop-sketch.html.
2. This blog post that focuses on the new Layers interface: http://blogs.adobe.com/creativecloud/fans-finally-get-layers-in-photoshop-sketch/
And, please, if you have any specific questions, don't hesitate to ask them here or through the in-app feedback (tap the Sketch icon then Give Us Feedback); I'm always happy to help any way I can.
(To get the full brush set, press-and-hold on any brush in the default toolset; it will open a menu with all the brushes and if you tap on any of them it will replace the brush in the toolset.)
Thanks for the tips Sue!
Of course as soon as I tried the program a few minutes ago it actually worked and I got all the menus and options for the very first time. Hopefully it will also be similar now with the other mobile apps I was having the same problem with.
Great. Happy to hear that.
Please let me know if you run into any trouble or if you have any questions.