Bluebook citation Syle
There are 3 or 4 blue book citation formats available. What are the differences? Are the more recent (2013) versions improved over the 2009 (Dev) version?
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Unless you are making heavy use of primary resources, I would recommend sticking with official Zotero until you have your workflow set up and are comfortable with the system. You can convert to MLZ at any time. You can move back to official Zotero after, but it is a little awkward. (MLZ is my own project, not supported by the core team, so whether to use it is a judgment call -- there are trade-offs, the choice depends on your priorities.)
Full support for legal citations will be coming to official Zotero in due course, but there are currently some things that can't be done in the standard styles. A partial list ...
It is a separate app that can read in an existing Zotero database and can sync through the Zotero server (including with Zotero installed on a different computer) but cannot easily be used in parallel on the same computer with Zotero (it's not impossible, just not easy).