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For each castle, there are rules for the CORRECT development strategy!
However, it's not always best to strictly adhere to them, as the maps vary (size, difficulty, number of resources, etc.).
In general, for each castle, you can define 2 tactics:
1. The map is resource-rich, with plenty of gold and other valuable resources.
2. The map is less abundant in resources, with only a few resources available near the castle.
In the first case, the focus is naturally on developing your forces and purchasing additional heroes for scouting.
In the second case, the focus is on securing your finances, at least by building a "Town Hall."
The first option is usually more promising and successful; your chances of winning are much higher than those of an opponent who is less fortunate in terms of location. (From personal experience, I can say that it's always more advantageous to have your castle located in the center of the map rather than in the corners... it provides more room for maneuver.)
Be sure to buy a few additional heroes for scouting and gathering resources if you have the funds at the beginning of the game. Ideally, the area around the castle should be well-explored on all sides.
After that, it's simple: accumulate your forces, level up your main hero, and capture castles. :)