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Here's the single most important part of playing a caster: Perram's Spellbook.
Playing a prepared caster? Print all the cards for spells you've learned, then pick enough of them each day to fill your slots as necessary. If you plan to use the same spell more than once per day, print 2 of that spell.
Playing a spontaneous caster? Just print off your spells known and keep a tally of spell slots used per day.
Your bookkeeping has just decreased by about 80%. I will put in a plug for Perram's Spellbook any day of the week and twice on Sunday. Play what you want and worry less.
Regarding Mystic Theurge, your dump stats are everything you don't need as a casting stat, pretty much. Because of the faster spell progression, you're going to want to be Cleric or Druid + Wizard or Witch. Unfortunately, that means 2 casting stats, both of which need to be respectably high. If you're new to casters, this is the one thing I would recommend against playing because the spell lists are SOOOOOOOOOOOOOO HUUUUUUUUUUUUUUUGE and it gets intimidating fast, particularly with the Divine lists being always known on Cleric/Druid.