There are different versions of Tableau.
Register an account with Tableau, and watch the 3 videos for getting started.
You also need to prepare your data into a format that Tableau could process. Read tips for working with your data. To learn more on how to structure your data, read get your data Tableau ready and tips for managing your data.
Watch the Tableau videos shared by your professor.
To learn more about how to build visualizations, watch section 4: Building Vizzes.
Before you publish your visualizations, you can create either a dashboard or a storyboard. The dashboard is to have visualizations on one canvas, while storyboard looks like a photo book that you can flip.
To learn more, watch the videos on dashboards and stories.
Once everything is ready, you can publish to Tableau online. Watch the video on publishing and embedding vizzes.
Remember, you can only publish visualizations you created using public dataset. Do not publish something you created using data that is not publicly available. School district data from ISD websites, or census data are fine, but do NOT publish visualizations created using data from ReferenceUSA. You can also disable data download so that people can only download your visualizations, but not your raw data.