A 102 Yes.
A 103 Scrolls, no, as you're still casting a spell, which would cause the spell you're holding to dissipitate, even if it's the familiar holding the charge. Wands don't require spellcasting, so yes.
A 104 Yes, spitting acid isn't spellcasting.
A 105 Outside their acid spitting, no.
Q 106 Does the damage increases from Shikigami Style and Improvised Weapon Mastery stack?