This will teach you and give you the basics how to create a sign. Create a new file with the dimensions indicated here:
1024x768 px and
72 dpi. Finishing creating it, paint it in black color.

Choose then the following tool

to select from the table an appropriate cliché for that you are intending to do next.

The color should be
D51717. Make a click on the right mouse’s button on the triangle’s layer and apply
Free Transform selection to turn it on that angle you may see in the picture below:

Take the next instrument

to create another triangle inside of that one we already have. Its color is
D7D7D7.
