You might decide to write an original document for publication, but in all likelihood, you're probably looking to revise a course paper, poster session, conference presentation, or section of a major paper or thesis for publication. If you're planning to write an original document, you can move to the next step for information on how to choose a journal that is a good fit for your focus. If, however, you're planning to revise an existing document, here are some tips on deciding which project to choose:
Think about what you learned from writing the paper, and consider if this information would be new to colleagues in your field. If so, there's likely a journal where you can get published.
It is inevitable that your existing paper will need to be edited, revised, or partially or significantly rewritten before it's ready to submit for publication and to ensure that you don't self-plagiarize, so choose a paper that you're excited to share with your audience. Your interest in the topic will help to keep you motivated.