Guide on adding a new model, animation, and creature to HoMMV

I saw something about 100 frames; here's the thing: I have 3ds Max files with the animation length set to the actual duration of the animation, but after exporting to FBX, it automatically sets it to 100 frames. And here's the issue – personally, I don't know if it's necessary to set the length in the file and then use ActorX, or if it does it automatically...

Regarding the MOV animation – which specific bone are you talking about? I didn't touch the basic bones from the game at all; I was working relative to them... (unless I accidentally clicked something with the mouse without noticing).

I've never done this before: "Animation [Alt+A] -> Poses -> Set as Skin Pose"...

But what does 3ds Max have to do with it? I meant that in the Heroes 5 editor, one animation worked after exporting...

As far as I remember, in some animations, the first frame is different.