Walkthroughs for custom maps.

Started the "Rise of the Necromancer" campaign. I already have an idea of how to complete the first mission, although it won't be quick. The only thing I don't understand is which secondary skills the main heroine should have, and whether it's necessary to invest in support skills.

Added after 10 hours and 12 minutes
Is there a way to see which heroes can be transferred to the next mission in the campaign? I haven't had to delve into the campaign editor before.