Each Sword & Shield booster pack contains 10 cards. Listings commonly break that down as 1 rare, 3 uncommon, and 6 common cards.
Booster pack contents are randomly selected. Each listing refers to a single booster pack, so the specific cards you receive are a surprise.
Most Sword & Shield items list a suggested age of 12 years and up; at least one boxed set lists a suggested age of 6 years and up.