To see a sticker in a dream, denotes to your tendency to stick with things and do not let them go. Probably the dream tells you to let go the old times and move on. On the other hand, the sticker could indicate or remind you something you were willing to do for a while. Consider to look at the stickers and the way they look at in the dream as it would give much more information about the dream.
Dream dictionary: Sticker dream meanings
To stick it over a package announces good news. Over luggage, a trip in the horizon. To read it over an object indicates unexpected expenses.