I would suggest you taking a look on this online material which provides step by step guide to build your first dashboard
If you are looking for a free online workshop or immersion day with trainer, you may refer to below
EMEA timezone Immersion Day (EMEA): Visualize Your World with Amazon QuickSight, 9 AM BST
AMER timezone QuickSight Author Workshop Immersion Day (online) -- 2nd Wednesday of each Month
If you are looking inspiration of how to design a dashboard, you may refer to below
https://democentral.learnquicksight.online/#Dashboard-DashboardDemo-AWS-Analytics-Demo-C360