Take careful notes. Careless note-taking can lead to unintentional plagiarism. You can put quotation marks around words that are taken from someone else or highlight them in your notes so that you remember that they are exact quotes.
When creating a paraphrase, read the text that you would like to reference then put it aside and rewrite the text without looking. This will help you from copying exact wording from the original.
Create a working bibliography while you are researching so that you will have the full citation that corresponds with each reference when you write your paper.