How to start another life abroad. What do you do from the day you decide to..?

Depending. Passport and or visa.Money aside for the time between departure and settling in. Preferably a job lined up before you go...or some other form of definite possibilities (new country does not want you as a "load". Apartments you can look for on the web for the city you are going to. And you must be prepared for a ton of cultural change. it is a good thing to read read about the country you are going to.