To sum up our answer: Allah, may He be exalted, informs some of the angels (namely the angelic scribes) of the events that will happen in the coming year, and He instructs them to copy it from al-Lawh al-Mahfooz. With regard to any additional information about the giving of individual instructions to each of the angels from those pages, there is no evidence to support that. And Allah knows best.

Qadar means that Allah has decreed everything that happens in the universe according to His prior knowledge and the dictates of His wisdom.