Regarding the ID — to avoid conflicts with other creatures, you need to check for unoccupied slots HERE, claim one for yourself, and then notify the NCF project community about it HERE (this is actually the final page) :smile25:
Regarding stats — it's up to the creator' same imagination, but for balancing purposes, it is recommended to use a special calculator — NOIADE

To start modding, I recommend tinkering with simple creatures visually, i.e., without added 3D elements — just (and not so much) recolored textures; for example, these creatures:
Brigand, Malachite Gargoyle, Azure Gargoyle, Ulem and Cadaver

After that, you should experiment with creatures that have recolored effects, namely:
Fire Gremlin, Namtar and Rakshasa Kali

P.S. The most important thing is to understand and subsequently follow the folder structure :smile09:
You also need to learn how to use TotalCommander, AkelPad, and 7z :smile33:
Learn to use Paint.NET, GIMP, but personally, I still recommend AdobePhotoshop CS3

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1