I'm sure it wont be long before the game releases and someone creates a wiki page with all spells listed, level required and what they do.
For now, there are vendors in town and you can always go peruse the books on sale to begin creating your own lists of spells available:
Scoundrel/Witchcraft 2nd floor of the Inn
Marksman/Aerotheurge/Hydrosophist in the marketplace
Man-at-Arms Captain's northeast of town.
Pyrokinetic/Geomancer 2nd floor of the Captain's
Just read the skillbooks they have for sale and build up a mental collection of spells.
