You will start in 1936 year of spanish civil war, ethiopian war against italy, second sino-japaneese war, you will try to improve technology, invade countries, etc. It will be a world war in 1939: you should choose the correct things and try to survive... also you can change the predeterminated settings and choose another year, also when you chose a country i usually say things like his religion or his leader, i also recommend to create the bizantine empire