Tick anything you already have, in any order. Quests unlock once this is done.
The social is where you actually learn, because leading and following only work with strangers. Classes without one leave you dancing with the same partner forever.
Find a salsa class near you2 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: Take a beginner salsa class