Congratulations!
You won't find a bad seat in Arrowhead, but sitting in the lower level probably provides the best overall experience.
During the week, tours are availabe at Arrowhead.
Plan to stay downtown, not near the stadium. The stadium is off the beaten path and there's not much to do out there in terms of restaurants, shopping, entertainment, etc. You'll have a much better time staying in the downtown area. Look at downtown proper, River Market, Crossroads, Union Station area. These are all along the street car route, and will allow you to travel through the KC downtown area for free without the need for a car.
Definitely visit the WW1 museum while you're here. Australia played a major role (over 300k soldiers) in WW1, and several Aussie uniforms and relics are on display in the museum.
Also, see some live jazz while you're here. The Green Lady Lounge is my favorite – grab a cocktail there one evening and take in the prohibition era vibes. Also worth visiting if you're into live music is Knucklehead's Saloon, which is in Electric Park near the J. Reiger Distillery. They have live blues/country/rock music every day and some of the cheapest drink prices in town.
Have fun!
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