[MANUALS] How to start playing Heroes of Might and Magic Online

Is there really a Russian localization available?((((

There is no Russian localization, and there won't be one.
But don't be afraid to play the online game in English, as there is a large Russian-speaking community and a detailed forum in Russian. You can always get help and learn everything you need to know, and over time, you will be able to easily navigate the game yourself.