Tick anything you already have, in any order. Quests unlock once this is done.
Simple enough for a child to draw, meaningful symbolism, two or three colours, no lettering, and distinctive. Everything else in this hobby is argued from those.
Read the flag design principles2 things left above. Quests are real things you go and do, so they only make sense once you have what you need.
First one waiting: Identify twenty national flags on sight