I'm kind of a newbie at LaTeX, but I've been playing around with the csquotes package some, and I've found the extra documentation of csquotes to be really helpful. In the csquotes documentation folder of your latex installation you will find a file called tutorial.tex, and what I've done is latex that file to get the finished pdf output and then compare the two to see what Tex code generates what output. There are a significant number of comments and suggestions in the tutorial.tex document as well, and it is definitely worth reading.
For the latex package documentation, I'm not sure how to tell you to find it. I'm on a Mac, using MacTex, and for me there is a shortcut under HDD/Library/Tex/Documentation. If you're on Windows, I can't really help too much. Find out where your texmf tree is, and poke around in there. Once you find that, it looks like it would be something like
texmf-dist/doc/latex/ [on my machine, at least]
There should be folders for all the packages installed on your system, with various documentation files for each one.
The tutorial file tells you how to modify the blockquote environment, and my solution was taken from the tutorial (search it for "smallquote" to see the original code I've modified.)
%%================== Single Space Blockquote Trial
\documentclass{memoir}
\usepackage{csquotes}
\newenvironment*{singlespcquote}
{\quote\SingleSpacing}
{\endquote}
\SetBlockEnvironment{singlespcquote}
\SetBlockThreshold{0}
\DoubleSpacing
\begin{document}
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do
eiusmod tempor incididunt ut labore et dolore magna aliqua.
\blockquote{Ut enim ad minim veniam, quis nostrud exercitation ullamco
laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure
dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat
nulla pariatur. Duis aute irure. dolor in reprehenderit in voluptate velit esse
cillum dolore eu fugiat nulla pariatur} Duis aute irure dolor in reprehenderit
in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
\end{document}
%%===============================================
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For the latex package documentation, I'm not sure how to tell you to find it.