Voting Question: How to get ready for a 5km hike?

I admit, I'm a fat guy. I weigh like 120KG, but I can walk like 2KM, but that's on flat surface. I'm going on camp next week for school, and one of the activities was hiking, and I'm pretty nervous. Can you guys help me out? What do I need to eat before the hike, what do I need to consume during the hike, and what do I wear? I'm 15 by the way, I don't have access to those pro hiking equipment.

Source: http://answers.yahoo.com/question/index?qid=20110831035558AAKook9 "> http://answers.yahoo.com/question/index?qid=20110831035558AAKook9

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