1: No. Druid's Leaf Ring has "Druid Only" on it, so you cannot include it in your spellbook, as per page 36 of the rulebook. Since you cannot have it in your spellbook, there is no possible way for you to prepare that spell during the Planning Phase.
2: I believe you do. Page 20 of the rulebook states: When you cast a spell with the Spellbind trait, you may immediately bind a spell to it. You can choose any spell from your spellbook that fulfills the limitations on the Spellbind object. I interpret that to mean that the bound spell is chosen before your teammate would become the controller of the Mage Wand (as in, I believe it is chosen at the end of Step 1, and your teammate gains control of it at the end of Step 3 when it resolves).