This is a very broad question. You would benefit a lot from searching for introduction tutorials e.g.
https://doc.arcgis.com/en/dashboards/latest/get-started/create-a-dashboard.htm
https://learn.arcgis.com/en/paths/try-operations-dashboard-for-arcgis/
https://learn.arcgis.com/en/projects/build-an-interactive-dashboard/
More specifically you will want to:
- Have access to a role in an ArcGIS Online organization. If you don't have one, you can sign up for a free trial, but need to consider the long-term implications of how you want to hosted it.
- Create Hosted Feature Layers for your data, as well as Feature or other layer types for supporting/reference data.
- (optional but recommended) create a web map
- Add your layers
- Configure pop-ups or disable them
- Add symbology
- Configure scale levels
- Create your dashboard. Add a map, infographics, selectors, tables and other widgets to interact with the data. You can add actions, so that clicking part of an infographic filters your data. Lots of options here, but make sure you brand it - your logo, title, contact information, etc
- Share the web map, layers and applications to groups within your organization, all members of your organization, or the public as required.
Let us know if you need more to get started. You can always come back with more specific questions later!
