It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
Where can you get data to use in a GIS? The UM Libraries have geospatial data in the collections, many websites have free data, and data can also be purchased.
GIS software exists both in commercially produced and open-source versions. The commercial options have more functionality but can be expensive. Use whichever one you have or are comfortable with!