IC has it right.
The best thing the 14 year old can get out of this trip, is a sense of independence and RESPONSIBILITY ;)

He's closer to being a man than a child, I'd give him plenty of "man" chores to keep him busy without being a Schmuck about it ;)

Explaining the "whys and whens" , before they happen will give him a chance to take responsibility for his actions and let him feel like he's a valuable part of the trip.  Personal responsibility is sadly lacking in today's youth. Money can't buy that, but the chance to share the load in a wilderness setting can.

Any lunkers you catch will just be icing on the cake, if you return with two  former "newbies" who have had the trip of a lifetime.