Try not to describe a broad subject, but to focus on a specific topic.
The information you mention in your paper should be properly sustained. You have to make use of decent sources (books, book chapters, academic articles).
Online materials can be used. However, refrain from citing Wikipedia or other online encyclopedia.
You should indicate the source or sources of all information mentioned or used in your paper by citing the source. Try to make use of an academic citation style (e.g., Chicago style; but any style is ok).
Your paper must include a list of references of the works cited. List the references alphabetically at the end of the paper, and do not number them.
For more information on Karma in Japanese Buddhism read this:https://en.wikipedia.org/wiki/Karma_in_Buddhism