Start by setting out the magazines in the middle of the table with tape, glue, a blank white paper, and pens. Then have the whole family cut out things they would like to own such as the type of house or car. Consider what occupation the person might like to have, (no, you don't have to be young to dream of a future career, I still am trying to figure out what I want to be when I grow up) and also put in places you would like to live or visit someday as well as a future pet.
On the outside of your container, place the day you made the capsule along with a day for it to be opened in the future.