Hey aniway.
It's awesome that you are using QuickBooks Desktop for your school work. It's a great learning tool! Not only is it simple to use, the program comes with built-in warnings that'll alert you know when a feature isn't being used correctly.
Sample files are created with specific date ranges that may not work with your assignment, so you should reach out to your professor to see what they'd like you to use. Sample files are used to try out QuickBooks or test how to do something without having an affect on your books in your actual company file.
If your professor does require you to make a new company file, you can do so by following these steps:
1. Open QuickBooks Desktop.
2. In the No Company Open window, select Create a new company.
3. At this point, you have two setup options:
A) Select Express Start if you want to get started right away. You only need to enter your business name, industry, and business type to create your company file. You can enter this info later on.
B) Select Detailed Start if you want to do a complete setup so all of your info is in from the start.
4. Follow the onscreen steps to finish the setup. Note: If you have an existing company file in QuickBooks, give your new one a unique name. This prevents QuickBooks from accidentally overwriting your data.
Good luck on your assignment!