Yes, Buddy Management feature in AppHQ is not available yet. We are working on it and would be push in Production in next month. Can you please let me know what exactly you want to manage in buddy from console?
To fetch all buddies or search specific user, you have to first create user base using User Service or if you have any other user base like google/facebook or your own, you have to use that for searching.
To send push notification, user device should be registered with App42 which can be done on app installation on user device. See here for complete tutorial of push notification.