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Well, I can't promise to give you a detailed walkthrough, but I'll try my best (I played the game about a year ago).
Let's begin! You start in the upper left corner of the map. In front of you are Paladins who will definitely join your party. Recruit them and head straight ahead. There, you'll find a Dwarf Castle. I cleared it in an auto-battle without any losses. You can't build much there; I just used it to generate 1000 gold per day. To the left or right, slightly above the castle, there's a Dungeon. Enter it, travel through it, and exit upwards onto the land through another Dungeon. Continue a bit further down the map along the road. There, you'll encounter a Turquoise player who will automatically attack you. Keep going down after the battle, and you'll find a Human Castle. There, you can build mines, structures, and creatures, etc. The main thing is to develop your castle as quickly as possible so that you can defend yourself if the Turquoise or Red player attacks. The Red player didn't bother me, although once he arrived with an amazing army, but I went down and to the left, to a Dungeon and a Fort on a hill, and waited there. So, after you free Duncan, immediately take him somewhere to hide (his army consists of 1 peasant). I hid him in a Dungeon, but when I replayed, the Red player often visited that area. When you free Duncan, all Castles and heroes become yours. After that, I can't say for sure because luck helped me (the Red player went to his castle and didn't come out). I explored the map, captured all the structures, and directed the caravans to the castle that you capture after the Dwarves, according to my explanation. There, I gathered 40 Paladins, 80 Inquisitors, 150 Griffins, 500 Halberdiers, 700 Archers, and 1,400 Militia. I cleared the castle, built a ship, sailed into the water, and the next day, the Red player arrived with a nasty army for me. I defeated him, and a video clip played. That's it, good luck with the game!