The Jacobson Center offers individual writing conferences, courses to improve writing, and online help to guide students through the writing process.  See especially the Jacobson Center's Writing Process Series, which breaks the writing process down into a series of steps and offers advice and strategies relevant to the main issues confronting most writers.  

• Remember to cite your source, when either quoting directly or paraphrasing. In other words, cite your source whenever you present an idea that isn't your own.
• Websites must be cited, too; if you cut and paste - or paraphrase - from a website, cite the webpage; make sure you include the URL and access date.
• When in doubt, cite your source.
• Remember to include a context for each quotation/paraphrase. Who said it? Why does it matter? How does this support or contradict the argument you're making?
• Use one of the style guides listed on the Citation Guides & Style Manuals page
• For managing large numbers of sources, consider using Zotero.

Critical Evaluation of Resources (Univ. of California Berkeley) - Covers scholarly vs. popular publications, primary vs secondary resources, authority, documentation.

Evaluating Web Pages: Techniques to Apply and Questions to Ask (Univ. of California Berkeley).