Tick anything you already have, in any order. Quests unlock once this is done.
Never alone, and never somewhere without an easy exit. Cold water groups exist almost everywhere and they know the tides, the entry points and the bad days.
Find a cold water swimming group2 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: Get in slowly and control the cold shock gasp