If you have already started writing a text in Word (or any other word processor), there are tools that can help you to import your references into Zotero.
AnyStyle.io: this tool allows you to copy and paste your references (note: each reference must be on a single line), parse and convert them into a format that can then be imported into Zotero. Select the BibTeX format. The file will automatically open in Zotero, or you can open the File -> Import menu and select the file (with a .bib extension). The references will be placed in a special anystyle collection. Do not forget to check the references and make some corrections if necessary. It is recommended to divide the references to be imported into groups of maximum 10 references.
Citation Finder searches for citations online and then allows users to select and download the correct citations. It works well for certain types of documents, such as journal articles, whose references are easy to find online, but is much less efficient for working papers or book chapters. Its great advantage is that it can help to correct potential errors in the references of the original document.