Creating Workspace

At first, we need to open Photoshop to create a workspace.
Below are images from Photoshop CS5 Extended Version.

After opening Photoshop,

This is how it looks like inside.

To create workspace, first click on File > New
Shortcut: Ctrl + N

After that,

We can change the name.

Select the width and height you want.

Select the resolution you want.

You can also change the background contents.

Once everything is done, click OK.

and here is your workspace.

You can now start creating your masterpieces.