Get a mentor.
Find somebody that has experience in the BC that is willing to take you under their wing. This payed dividends for years to me, probably even saved my life. They will help you to develop a "gut feel" in the mountains. Trust your gut, but verify with a snow pit.
Advice that was given to me as a young man by my mentor; "There are old backcountry skiers, and there are bold backcountry skiers, but there are no old, bold backcountry skiers." Simply put, dial it back a notch in the BC, rescue is a long way off if needed. If you get hurt, it is not just you in danger, it is your partners as well. Probably more important that your son hears this than you, but words to live by nonetheless.
Learn to adjust your pack on the fly. You can shift weight on and off your hips with the shoulder straps. Get in the habit of tightening those straps before the descent to pull the weight closer to your body. Practice this on dry land, and it will become second nature.
Pack a little extra food and water. Also thrown in a space blanket in each pack. You never know when you might have to be out there longer than expected (see old/bold comment above).
Make sure you look up when going up. It is easy to just follow the skin track and trudge along. But do you look at your skis the whole time you are on a chair lift? Enjoy the views!
Have a great time, BC skiing is the best!