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It’s best to play the elf campaign on version 1.1, as version 1.1 fixes bugs, although the building costs haven’t been adjusted yet. In general, mission 1 of campaign 5 is the easiest. The main thing is not to do stupid things like killing the bear on the border, crossing over with the garrisons, or losing 2 of them. On the map, there are 3 trees, one of which is near the castle. You need to restart the game to get the magic of light from it, which you can then use to obtain resurrection from the mage’s repository. This will make mission 2 and the others much easier. In general, there is a lot of experience and upgrades on the map, and they are obtained quite quickly.