Step by step I am creating the component, as in the video, but when entering the sandbox do not see the button "new".

In the builder I see the button, but I do not see it in the sandbox

You must create at least an item layout to see 'new' and 'edit' buttons.

That's all.

In addition, one the layout created, you have to validate it by clicking on the save icon on top right of the layout

I found the solution, my component was before the server change and was not pulling some parameters.

Another question, how I can sort by other field and sort descending