Hello Im looking a tutorial like this link
You can actually start doing that in Godot, almost right away . . The difficult stuff is in making the 3D, the characters, the textures . . That's done in Blender, or 3DS Max, Blender is free, of course . .
The way I see it, you could start developing that game in less than 15 minutes, in Godot . . .
I mean I have the 3d assets but use background with isometric look and place the 3d characters on walkable are as seen on the video thats the tutorial I m looking for...
For an isometric look, you would use an orthographic camera projection. Then you can use a gridmap to lay out your level. This video shows how to use gridmap.
This video should help with some of the math (it is not that different in 3D):