I've got a bunch of Imperial Assault expansions that I bought for skirmish components but I have only ever played through the introduction mission in the campaign. I've recently gotten Descent and have been playing it with my daughter. She's having a blast. We're thinking about digging out all of the campaign stuff and giving it a go.
When picking heroes, should I have the players select from all of the heroes that I have available or should I limit it to just the ones that come with the campaign that we are playing?
My understanding is that each expansion is a self contained campaign and they are not played sequentially with the same characters. I've got the core set, Hoth, Bespin, and Twin Shadows. Is there core campaign the best place to start or are one of the other campaigns better to start with?