I don't know whether you have gone through the tableau gallery or not. If not then I'd recommend to have a look once to get some inspiration.
You can find the dashboard based on topic.
Another easiest way once you connect your data source in tableau desktop/public for analysis. Just select dimension and measure using Ctrl key then go to show me and check. Show me will show you what possible charts you can develop using those select dimension and measure. Even if you don't select any attribute you can simply go to show me and if you hover on any chart at the bottom you can see the prerequisite of the chart.
Let us know if this help.