Now that you have your backpack here are some tips on how to pack it.
You should start by putting the lighter items in the bottom of the pack, such as a sleeping bag, jacket, and sleeping pad.
The basic principle is that you want the heavier items towards the top and closest to your body so they are closest to your center of gravity. Things like your tent and food and water bottle would be good items to put closest to your back. Then you can fill in around it with clothing and other lighter items.