To draw a parallel, a lawyer researches and reads about many cases and uses them to support their own case. A scientist reads many case studies to support an idea about a scientific principle. In the same way, a history student writing about the Vietnam War might read newspaper articles and books and interview veterans to develop and/or confirm a viewpoint and support it with evidence.
If you find one really awesome book or journal that fits your topic perfectly, try looking in the works cited/bibliography/reference list at the end of it. This should contain many more books and journals that are about your topic as well.
If you are struggling to come up with a topic that feels “just right,” ask your professor or coworkers/classmates for advice. They will likely have great ideas that, even if they aren’t options for you to choose, can inspire you with new ideas. Asking a professor for help may seem frightening, but if they are worth anything as a professor, they want you to be successful with your work, and will do what they can to make that happen.
When you have edited and re-edited your paper, formatted your work according to the subject matter, and finalized all the main points, you are ready to create the final draft. Go through your paper and fix all mistakes, rearranging information if necessary. Adjust the font, line spacing, and margins to meet the requirements set by your professor or profession. If necessary, create an introduction page and a works cited or references page to bookend your paper. The completion of these tasks finalizes your paper! Make sure to save the paper (in multiple places, for extra security) and print out your final draft.