alteration 3 is probably buffs for your sc pretender .
alteration 6 is good too : invulnerability + soul vortex for your scs , false horror for your mages .
conjuration 7 is good for air queen scs .
construction 6 is good for equipping the airqueens .
staff of storms , air empower items etc.
good earth items like gate cleaver which your dwarfen smithes can forge .
evocation is good too especially until evo 7 :
key spells : wrathful skies , shimmering fields , orb lighning .
as long as your enemy isn't lighning immune with wrathful skies + shimmering fields or if you don't have that many gems with shockwave is really a brutal troop killer
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i would go enchantment 1 ( for fireshield / breath of winter for my sc pretender ) then alteration 6 (perhaps 7 for phönix pyre for my pretender ) .
then thaum 2 for sitesearch spells .
then evo 2 for lighning bolt .
after that conjuration 7 to get at least 1 airqueen then construction to equip her and then evocation 7 while you forge equipment for her .