Seperated

In a world where every 4 years the leaders of the society choose 4 teens between the ages of 12 and 16, 2 of both genders, and send them to a wild island at the middle of nowhere. The four kids chosen get new resources once a month but are otherwise left alone for 3 and a half years besides hidden cameras all over the island, recording them.
Soon after Jessica Jackson turns 13, she finds out that she has been chosen for the Selection.but what happens, when some time after the kids have been send to the island, every single leader of the society disappears? Recourses stop appearing to the island and winter is starting to settle on the island, leaving the kids confused on what to do now when they run out of food.

(U know what i hate? When i start writing a story or something, it all just pops up in my head, like I have all these different charecters and scenes in mind, whats going to happem and so on, relationship between people + & -, but then when i try to write it. I have no idea what to put in all the places between... ;-; )