I wanted to ask you all how can I create a NEW (custom) right side sidebar for general purpose like inventory, cell phone, and "wrist watch". I kinda have the ideia it can (and must) be done with CSS, but I wanted some help I'm kinda new to CSS and I don't know it's strengths yet

Thank you for your help.
Comments
I suggest you remove the <hr> element from the Right Sidebar passage's content.
You will still need to use CSS to place the #right-side-bar element (containing the output of the Right Sidebar passage) on the right side of the screen. The following CSS is based on SC2's own #ui-bar element and needs to be placed within you story's Story Stylesheet area.
Now any content you place in the Right Sidebar passage will appear in your new right sidebar.