Our UT library guide to the citation management tool Zotero is here -- Zotero: Getting Started.
Zotero's own documentation is here -- Zotero: Support, including:
Remember that citation management products are great but not perfect. You need to keep an eye on things. It helps to have access to the full style guide or at least know the essentials of the style. Some help is offered through the Cite Your Sources guide.