Block Quote

Hello,
enter your text, which belongs to the block quote and select it.
Open the "Inspector" and chose the "Text" properties (the big "T"). Now you can format the text as you like (spacing, alignment). Select "Tabs" and change the "Paragraph Indents" to the values you want. If you are finished with the formatting go back to your selected block-quote-text, do a "Control-Click" or a "Right-Click" on it and select "Create New Naragraph Style From Selection..."
Name the new paragraph style "Block Quote".
Now everytime you want to enter a block quote in your document, you can select the style from the "Styles-Drawer".
Also consider making a template, which includes your new style.

Jeremy,

Christian's suggestion is a good one and would likely work for you. If a block quote is what I think it is, you might want to consider using a text box for it. That way you can easily position it anywhere on the page, and wrap body text around it.