What Yvan says applies to show a measuring ruler which appears to be the first part of your question. By going to Format > Rulers > Ruler Settings... you can choose the type as Text or Graphics as well as the desired units. The text ruler only appears across the top of the document, the graphics ruler will appear across the top & down the left side of the document.
In your second question, the wording makes me think you are referring to the command "Copy Ruler" (⌘⇧C). This, along with Format > Rulers > Apply Ruler (⌘⇧V) are used for copying the settings (indent, tabs, spacing, etc.) of the paragraph the cursor is in & then applying those settings in another paragraph or several contiguous, selected paragraphs.
