Welcome Istaron !
About spells, to get a list, download an editor like GateKeeper (a program to edit your saved games), there you have a Spell Browser that will help you.
About the scrolls, SPOILER:
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- Improved invisibility can be found in ulgothīs beard (you need Tales of the Sword Coast).
- Shadow Door, i think it cant be found except on random treasures (amd you gotta have a incredible luck for that
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"Iīve been captured... and I donīt care" -Ertai, Captive of the Blinding Angel