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

Please ask your question more specifically. Are you referring to new static objects, or a new model for a static object? In any case, the answer is simple. You add a new model in the same way as a non-static model; in general terms, refer to the manual in the header of the topic, simply skip the sections that relate to animation. As for a new object, study (using the editor, for example) how static objects are structured in the game and copy this structure for your new object.