If you want to distribute a Scribus file - this is a file with a ".sla" extension - then you'll also need to distribute the fonts and images that are used in that file (the .sla file holds the text). You can do this by using the "File -> Collect For Output…" function. You would normally only need to do this if you were sending the file to be edited by someone else (or, in some cases, professionally printed). That person would also need a copy of Scribus installed.
However, and I'm guessing this is what you actually need, if you want to distribute a file that can be read by someone who doesn't have a copy of Scribus - i.e. the general public - you can export the file as a PDF (these files have a .pdf extension). A PDF is a self-contained document which holds all of the text, images and fonts needed to display the document. The end user will not have to load anything else to read the document. All they would need is one of the many PDF reader applications that are freely available, and a lot of modern operating systems have a way to read PDFs built-in. You can export as a PDF in Scribus via the "File -> Export -> Save as PDF…" function.
I'd strongly suggest that you should first go through the wiki tutorial at
http://wiki.scribus.net/canvas/Get_Started_with_Scribus. This will give you a good grounding as to how Scribus works and what you can do with it. (It also has more information on PDFs near the end.)