Avoid plagiarism when copying (paraphrasing) paragraphs for the background section of Masters Thesis
If you are paraphrasing everything then a single citation is enough, but provide a hint, at least, about where that section ends. 

If you want to use direct quotes make it obvious that you are quoting using some textual hints (quote marks are only one way). It might be necessary to note that your quotes of definitions, etc, come from the original work. 

It isn't hard to make sure that everything is correctly cited. What is hard is not making it look messy. If you can use foot/end notes then you can make citations less obvious, hiding the details in those notes.