Below are some resources to help you avoid plagiarism in your writing:
Examples of paraphrasing (MIT)
Plagiarism (UNC-Chapel Hill)
How to paraphrase a source (University of Wisconsin)
The MSU Writing Center
The Writing Center in Michigan State University offers consultations at locations on the MSU campus, as well as online.
They have quick guides on their services here http://writing.msu.edu/resources/quick-guides/
Guide to Grammar and Writing (Capital Community College) A great overview of grammar and how to avoid common writing mistakes.
In the social sciences, writers usually use active rather than passive voice. If you majored in a health or natural science for your undergraduate degree, you might have been told to use the passive voice in your scholarly writing, so you'll have to switch when you write papers in public health.
Passive Voice: A mistake was made by the Finance Department.
Active Voice: The Finance Department made a mistake.
You can find further explanations of active/passive voice on these websites: