Google Scholar will allow you to add citations to Endnote Basic, as well as to other citation managers. Once you have done a search and have citations in front of you, you'll see that there is a "Cite" link at the foot of the reference. When you click on that link, you will be offered three versions of the citation which could be copied and pasted, but there are also links in the bottom edge of the box that show BibTex, RefMan, and EndNote, among others. Click on the name of the product you use, and then log in as needed, and the citation should be imported into your list of references.
Web-based Citation Managers:
EndNote Basic allows you to save citations to a personal database and then format those citations in footnotes, endnotes, or bibliographies. It is available through Web of Science.
Zotero is a free citation manager that is commonly used in academic circles; we don't have formalized support for them, but they have help pages and your librarian may be using one or more of them.
Various disciplines differ in what style they prefer. Journal citation styles may be required. Endnote Basic and other citation managers include many of the journal-specific styles. Ask your professor if you have questions about what style to use.