Zotero is a free, open source citation manager. It has a browser plug-in for saving sources as you search, and great integration with Word when you are ready to start writing (and citing).
Their documentation will help you get up and running in no time.
There are many citation generators out there, including as part of UDC Search and in the databases. These can be useful, but be careful! They aren’t always correct. If you use a citation generator, make sure you check it using a citation guide. Look for citation guides on this help guide's Resources page.
You can add sources in Word and use it to add citations and create your references page. Inputting your source information is a manual process that can be slow, but some people love using this feature.