Dangers of using a 'bile on glaciers.
I would start off with having a rope and harness...that is attached to one or two other people to stop you from falling into a crevasse. After that, it depends on the glacier (if you want an iceaxe, crampons, etc depends on the steepness). You'll also want something to setup anchors on the glacier, and some pulleys to pull them out. Whatever gear you take with you, you'll need to know how to use it first.