Mod World Conqueror 4 in progress

Hello, I'm preparing a new mod on World Conqueror 4, This mod will aim to make the game more realistic, the problem on World Conqueror 4 is that the conquest map are not realistic, but also less nations and flags that do not fit. All conquests will have all the countries that exist in the corresponding date, But I had 2 problems; the first is that I can not add the data of a new country in the Json CountrySettings file because otherwise when I launch a conquest in the game, the game stops, the second problem is that I do not can not unlock all conquests. I hope that people who are much more experienced than me in modifying the game World Conqueror 4 will help me to solve these two problems.