Okay, I can help with the second two questions, they are not PFS specific.
If you are a wizard / sorc multi class your spell casting for each is independant of the other. So in your question you have one wizard spell per day (bonus for high intelligence and specialization school if you qualify), which is chosen from whatever you have in your spell book.
Sorcorer you know two spell, which you can use a total,of three times per day in any combo. (Again with a possible bonus for high charisma).
Your bloodline or evoker bonuses only apply when you cast a spell, when you use a wand or scroll you are not casting the spell, you are activating an item.
The Wizard receives a "amulet, ring, staff, wand, or weapon", of masterwork quality, not made of any special material. The season 6 Guide to Organized Play states that the bonded item must be an "always available" item.
A non-magical, non-special material ring, staff, amulet or wand is not really exploitable, the free masterwork weapon is more interesting. The "Always available" limitation means that firearms, and weapons from the Technology Guide, are out. I don't know of any other weapons that aren't "always availbe" in their mundane form.
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IMHO, you really don't want to be a multiclassed wizard/sorcerer.
Why? It may seem cool at 2nd level to have nearly twice as many spells as another spellcaster, but the fun goes downhill from there, in the form of delayed access to higher level spells.
In fact the general advice is that you never want to multiclass from a pure spellcaster class, for this very reason. Although, given that pure spellcasters are generally considered to be head and shoulders above other classes in terms of power, you can probably get away with taking a one-level hit in your primary spellcasting class. Ideally, you would choose either sorcerer or wizard as your main thing, and just take the other for one level, in order to snag the pretty bells & whistles associated with that class (sorcerer bloodlines, wizard's arcane school, etc).
The other problem is that spellcasters usually need high attributes, and with this combo, you're split between INT and CHA. Let's say you manage to have a 16 in each (not impossible).
As a 1st-level sorc/wiz you would have:
- 3 cantrips and 3 1st-level spells as a wizard (1 base, +1 from INT, +1 from arcane specialization) which you have to prepare;
- while as a sorcerer, you would "know" 4 cantrips and 2 1st-level spells, and be able to cast those 1st-level spells 4 times a day. Cantrips are, of course, an unlimited resource.
Again, the downside of this multiclassing choice is that even if you never took a second level of your secondary class, you would forever be one level behind in your access to higher-level spells. If you split your levels more evenly as you advance, you would get further and further behind. A 12th level wiz/sorc with 6 levels in each class would have no spells above 3rd level... which might be a tad frustrating.
YMMV.