Congratulations on joining the amazing project that is TC-ECH as a Product Owner. Your users will thank you one day.
Modus Operandi
The MO of a Product Owner is to keep a prioritized backlog of Product Backlog Items (PBIs) for the delivery team to consume. Ideally, the backlog will always have at minimum two weeks worth of PBIs ready to go in case you win the lottery and disappear.
Required Reading
Required Training
Time Commitments
Lines of business will be assigned to alternating sprints to reduce PO time commitments (POs are only needed every other sprint). The sprint schedule is found here in DevOps: Calendar - Boards (azure.com)