1:03 p.m. on October 15, 2011 (EDT)
Trying to learn everything piecemeal here isn't very efficient. If you know absolutely nothing about backpacking, get yourself a book such as The Complete Walker (the best) or even Backpacking for Dummies (a good beginner's guide) or better yet, start with this one-
http://www.amazon.com/Allen-Mikes-Really-Cool-Backpackin/dp/1560449128
It looks simple, but these guys are really good at explaining things for beginners. I have two of their skiing books.
Once you understand the basic concepts of shelter, food, clothes and navigation, then work on your gear list for where you are going. My gear list for Yosemite in winter won't be anything like your list for Tennessee.
The idea that a big pack means fill it up is nonsense. I don't think that is what Apeman means, so don't take it that way. The worst thing you can do is find yourself carrying a lot of unnecessary stuff. The fact that someone gave you a cooler for backpacking tells me they are clueless. Great for car camping, not for backpacking. A cooler is for heavy food that needs to be kept cold. Not what you want to take backpacking. If you want steaks for example (heavy, but okay for the first night), freeze them, wrap them in foil and stick them in a plastic bag. Put them in the cooler in the car. Leave the cooler. By the time you hike to camp, they will likely be thawed out.
Before you go, get everything out, practice setting up the tent a couple of times, make sure you know how the stove works, make sure you are prepared for bad weather and that if you are hiking in somewhere, you know basic navigation (map and compass) so you can find your way back.
DO NOT RELY ON A CEL PHONE TO SAVE YOU. People make that mistake all the time. Sometimes they luck out, other times they don't.
DON'T ASSUME YOUR FRIENDS KNOW MORE THAN YOU. They may not, so be sure to find out before you go, not after you are out in the boonies looking at each other and saying "now what?"
CARRY OUT WHAT YOU CARRY IN. If you insist on bringing wine for example, which some people do, then it is your responsibility to carry out the bottle, empty or not.
This isn't rocket science for the most part, but you'd be surprised at how many people go out unprepared, get lost and then someone else has to risk their life to go look for them. Use some common sense and that won't be you.