2. What spells should I share for my familiar via Imbue familiar with spell ability?
This depends a little bit on how your DM likes you to use your familiar (Does he let you simply have complete control?), but I like to have some scripted actions for the familiar, so the question of "How does your familiar know to do that?" doesn't come up. So, spells that's *always* cast in certain situations are useful, like, "I always like to cast this when x happens".
So, buff spells like Haste is good. Always pop it at the beginning of combat.
Another line of spells that are useful are spells that get your wizard out of certain troubles. Like the wizard *somehow* get grappled and mouth covered so the wizard can't even cast Dimension Door or something. I think I like Dimension Step, as this can be cast away from the wizard (Hit by Silence, or something). And useful in general in many situations. Since you have some Domain spells, you could give your familiar some spells that can stabilize, or remove conditions off of the wizard, in case your wizard's hit points go negative or get debuffed.
Also, another thing to consider is to give the familiar Orb of Force or something, and just have readied action, in case an enemy caster starts casting a spell. Pop the enemy caster with 50 points of damage, and force the concentration check. Your wizard use pro-active spells, the familiar goes defensive and have something reactive.
Lastly, Shield Other is another possible Domain spell to consider. Half the damage you take, the familiar takes it. Use False Life on the wizard himself, and share it with the familiar. Have a hero's feast, and as long as the familiar is safely tucked away in familiar pocket, you are doubling the effectiveness of those temporary hit points. Of course, this does come with a risk that familiar might get into trouble if you and the familiar both get hit by AoE spell...
One more thing. Remember Mages Lucubration is Personal range spell you can share with your familiar. You AND your familiar gets 1 spell back with only one casting!
Edit: Oh, ONE MORE thing. If there's a way to give your Familiar 'Harmonic Chorus' from CAdv (It's a Bard only spell)...
-K