At this point in your life, use the GI Bill primarily for a BS/BA degree, with flight training secondary.
I would do anything BUT "Aviation Management." When the industry is in a downturn, why have the same industry as your "backup"?
IT is a good field. With your electronics experience, you might even think about Electrical/Electronics Engineering. Meteorology might be a reasonable option, depending on the school and what the jobs outlook is for Meteorologists.
Take lessons while you're in school, as long as you can handle the financial load. If you can't fly at least once a week, delay until you can. Get the ground school and written test out of the way as soon as possible. While you can do it even before you start flying, for some people the experience in the air helps tie together some of the bookwork.