Walkthroughs for custom maps.

Hello. Could you provide some tips for the "Lord of the Rings" map, specifically the Chinese version, where you start with one creature? When you free the third hero from the prison, which is guarded by Azure Dragons, which hero is more advantageous to make your main character? I understand that different battles require different heroes, but overall, which one is the best choice? This map severely punishes mistakes.
Also, if anyone remembers the map well, could you point out the key moments (perhaps certain creatures need to be saved, or there are specific timings, or something else)?