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The order in which you choose the skills doesn't matter, but you need to develop all three branches.
If the skill I need is rare, I usually "forget" two skill slots. Then I fill one slot and develop it further until a new skill appears for the second slot. Then I remove the unnecessary skill and develop a more common, useful one. If that rare skill doesn't appear, I erase two other skills from the hero's memory. If I'm lucky, this will cost 100,000 gold, and for a particularly discerning taste (including mine :)), 200-300 thousand. So, stock up on money and patience ;).
By the way, a super skill is not always a priority for development. More often, a more useful set of skills is found. The only super skill that I develop for all heroes in all campaigns (and there are many of them for mages) when a mentor is available is "Arcane Mastery." You don't need to develop magic, and out of three skill slots, two are those that we will always take :). Very practical :).