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1. Scenarios can be created using map properties and scripts. The game editor and scripting manual will help you. (I can send it if needed.)
2. Dialogs and scenes are also handled through scripts (I'm not very familiar with them myself). Check here: /topic/3747/
3. Where to place them? On the map, you first place a random unit and then select the desired one using its properties (spacebar or object properties). In a town, do the same thing in the "garrison hero" tab under properties.
4. To create a fixed army, go to the same place where you choose the hero, in the "army" tab.
Герман стоял неподвижно. Герман сошёл с ума. "Старуха!!!" - закричал он в ужасе. Он сидит в Обуховской больнице, в семнадцатом нумере, не отвечает ни на какие вопросы и бормочет необыкновенно скоро: "Тройка, семёрка, туз. Тройка, семёрка, дама".