Tick anything you already have, in any order. Quests unlock once this is done.
The phonetic alphabet is the notation the whole hobby runs on. Without it you cannot record what your language sounds like, even to yourself.
Learn the IPA2 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: Steal one feature from a real language and use it