Add the info from here: http://codex.wordpress.org/Function_Reference/register_post_type to Roles and Capabilities Maybe this? http://wordpress.stackexchange.com/questions/16588/how-to-assign-multiple-roles-for-capabilities-array-withini-register-taxonomy-fu
Learn about Roles and Capabilities.
Look into get_meta_fields w/ $single turned on.
To extract user information, use Function_Reference/get_userdata