One of the first stops on your journey to learn how to earn and give badges is the OpenBadge.org site. Click the Get Started link to earn your very first badge and create your backpack to display your credentials!
Your very next stop should be Peer2Peer University (p2pu.org).
Leah McVie has created a great jump start course called P2PU 101 - What are Open Badges? that explains the badge concept and lays out ideas for rolling out your own.
Doug Belshaw, Mozilla's new Badges and Skills Lead, has another course entitled P2PU - Open Badges and assessment, which although now closed has some terrific conversations around the assessment process.