Much of what you need to know can be found in our 2016 Glacier Visitor Guide (7.8 MB pdf)
Zoom into the map for a lay of the land.
Looking for something more specific? Glacier National Park has many brochures and publications available online as PDF files and available through the mail. There's even a form where you can order information sent to you. Key trip-planning publications include Day Hikes in Glacier and Ranger-led Activity Schedules (posted monthly in summer).