Depends on what your interests are: history? scenery? oddball exhibits? A little more information and that can narrow things down for suggestions of things to see on the way. In 2 weeks time, you won't have a lot of time to dawdle; you can't really "see" Glacier in a day or two, especially if you want to hike. And it's a long way from Indiana.
I think using primarily I-90 will be your fastest route there; you'll need to use spur roads (US or state routes are generally good out here) from I-90 to get north to Glacier. I suggest spending a minimum of 3 nights on each side of the park (3 nights West Glacier, 3 nights East.) If that's not possible, considering how far you are going, then you may want to concentrate on just one side. East will be the easiest to get to from Indiana.
DO reserve (ahead of time) an all-day Red Bus tour. That way you will see both sides of the park - which are very different from each other - and won't have to worry about the drive over Going-to-the-Sun Road. BTW, that road may not open until July, due to snow. Just FYI.
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