Well, with those more than enough money you get from the raiding, with any luck you will get at least one of the spells. You have a lot of areas to look for them. Greenwort has 3 (castle, temple, mage tower), velarion has 3 (2 castles, mage tower), and there are many other buildings where spells are sold. In my eyes, healing is a great spell in the beginning. That's what's been keeping my horsemen alive even with 1 ressurrection from the inquisitors. Shield from archmages and heal. Unless the enemy stack is way too powerful (like those 678 peasants eghirra had in a stack) you will never lose even 1 tank.
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