PSS - The pack, shelter and boots are the things IMO that will make the trip enjoyable or horrible! If the pack and boots are not comfortable, every mile will seem like an eternity. If the shelter is not dry, too big or small, poorly ventilated, or totally falls apart, you will have a lowsy night! I would focus my time and money really examining these in the store and reading reviews. Again, try them out, set up the tent in the store, get in it, etc. The rest of the gear questions will be answered with experience and exposure to fellow backpackers' gear. As you get into the sport, you will know exactly what you want to buy. So - my advice - focus and money on shelter, pack and boots. Get other stuff on the cheap while you figure out what you want, what you don't need and the brands you love.