1:37 p.m. on May 17, 2012 (EDT)
Fist time back country trip? Sounds like fun!
May I ask how much experience do you and your friend already have? Any scouting experience? First aid instruction? Family camping trips?
Is this trip to be a backpacking trip where you camp in a different spot every night ( or most every night ) or will you be hiking in to a base camp and then enjoying day hikes and exploring the area from that base?
Callahan hit the nail on the head I think, I also believe it would be very wise to go on a few “shakedown” trips beforehand.
Even just overnighters in the back yard with the gear you have is instructional. Do try to work in a two night trip beforehand, if you can.
Lets see -
1) You’ll need to start planning out a menu, then assemble all that food and see how much it weighs. Seven days’ worth of food is quite a pile! Heh, at home cook and eat what you intend to bring, and how you intend to cook it in the field, even if that means building a cookfire in the backyard. – The first time you try a new recipe or food item or stove or cooking over a fire should not be when your way out in the sticks!
2) Same thing goes for the rest of your gear of course, cobble together what you have and see what will do, what you might need to make and even what you might want to purchase before you go. Do an easy overnighter or two, then a two night trip if you can. I wouldn’t worry to much about fancy gear myself. Start with what you have, try a few overnighters and see if you feel the need for fancier stuff. I never bothered with a tent or sleeping bag when I was your age and made do just fine with ponchos, tarps, wool blankets and the like, but I knew how to operate that way, was used to it and I was young and tough and comfortable enough on summer trips.
3) Get some maps of the area you want to go, and spend some time going over them with your companion planning out where you want to go. Be sure to plot out contingency plans if someone gets injured, you run low on food or the weather just turns real foul and the like. I’d recommend you be conservative for this first trip and not try to cover to many miles, bag to many summits or go to remote.
My first unsupervised five day trip was at about that age, but I’d had lots of experience with the boy scouts and many shorter trips. I still carried way to much stuff, but I had lots and lots of fun on that trip! By contrast, I have nephews about your age who are afraid of the dark, can’t swim a stroke, haven’t a clue about first aid and wouldn’t have a clue what to pack on such a trip ( I’m working on them! ). I can tell your light years ahead of my nephews though, if nothing else because your eager and willing to learn and to get out in the backcountry.