Adding your friend as an admin:
You can put him into a group and add that group to your account with admin permissions.
See Groups for Providing Access.
Quote from the link:
Groups for Providing Access
When you create a repository, Bitbucket checks to see if the owner's
account has any groups with a default permissions (read, write, or
admin) assigned. If you do, it adds that group to the new repository
with the default permission.
Adding the issues service:
In the meantime they automated adding the issues service for new repositories. You still have to enable the issue tracker itself, though.
See Enabling an Issue Tracker in the Bitbucket docs.
Quote from the link:
How the Issues service supports the issue tracker
If you enabled an issue tracker on your repository after August 2012,
Bitbucket adds the Issues service automatically for you when you
enable the Issue Tracker. Older repositories with older issue
trackers may or may not have this service.