1. Familiarize yourself with Scrum basics.
2. Attend a CSPO course you.
3. Continue learning the art of Scrum by:
The CSPO course gives you just enough information to understand how Scrum works, but focuses mainly on functioning as the product owner, or customer, for a Scrum team. You will learn about activities such as managing stakeholders, ROI, backlog grooming, creating effective stories, acceptance criteria for stories, defining done, and so on.
Becoming a Certified Scrum Product Owner gives you access to local user groups, online social networks, and other resources available only to CSPOs.
Read more http://www.scrumalliance.org