Get the Imperial Assault Campaign module for Vassal from http://www.vassalengine.org/wiki/Module:Star_Wars:_Imperial_Assault
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Cool. I think I understand. So for instance, if I purchased the Hoth expansion, no information for Dengar would be included unless I buy the Dengar villian pack?
If Dengar appears in the Hoth expansion (and he does), then the Hoth box has a cardboard token for him and his deployment card. The same applies to all figure packs that are associated with a boxed expansion - the boxed expansion gives you tokens and the required deployment cards. The figure expansion gives the figure and the required deployment cards. (So you'll have extra copies then.)
If a figure has different deployment cards for campaign and skirmish, then you'll get both.