[Legolas]

As a druid, you need Wisdom to cast spells, yes. Your base wisdom should be 11 allowing you to cast level 0 and 1 spells. A wisdom of 12 allows you to cast level 2 spells as well. It takes 19 wisdom (and sufficient levels) to cast level 9 spells, but again, only your base wisdom counts (the bonus from spells, potions and magic items boosts other parts of the spell casting).