How can I get a familiar for my character? He's a Draconic Bloodline sorcerer. Is multiclassing into Wizard or Witch the only way?
There are multiple single-class way. Bloodline Familiar is probably the best way for you, in exchange to your first level bloodline power (the claws, no big loss), plus delaying your bloodline granted bonus spells by a level, you gain a familiar of your choice. The Familiar Bond feat grants a familiar, but you wouldn't get some of the benefits, and you have to take Iron Will first. The Wasp Familiar feat, only aviable to chaotic neutral worshipers of Calistria, grants a predetermiend familiar, although a very good one. The Hand's Detachment feat can turn your hand into a familiar, but it costs three feats where the first two are of little use for you. Lastly, the Variant Multiclassing option for Unchained, if allowed by the GM, grants basiclaly class feature form a secondary class in exchange for half your normal feats, without halting your level progression in any way, and the Wizard and Witch option both grant a familiar (at 3rd level each). The Magus option could also grab a familiar at 7th level via the Familiar arcana.
If I must multiclass, how exactly does it work when you have multiple casting classes? Do you combine the spell slots somehow?
No, they'd be completely seperate. A Sorcerer 6/Wizard 4 for instance has the casting of a 6th level Sorcerer (3rd level spells but not 4th level spells, caster level 6 for those spells), plus the casting of a 4th level Wizard (2nd level spells but not 3rd level spells, caster level 4 for those spells). You never combine any class feature progression unless explicitly said so.
Another way would be the Eldritch Heritage Feat (Arcane). It would get you Arcane Bond, which can be a familiar. It would require a Skill Focus(Knowledge(any)) feat as a prereq and the familiar would be at character level – 2.
There's also a few magic items. A migrus locker, a periapt of temporary familiar, and depending on what exactly you want it for things like figurines of wondrous power might work for you.
Nope. Getting a +2 bonus to a skill is just that, it doesn't make the skill modified a class skill as well.
Also, concerning the familiar special abilities, do they make the skill they modify a class skill for the PC?
The really good familiar options are going to be ones that either bump up an important save like Fortitude or Will, or Initiative. I recommend considering the Eldritch Heritage(Arcane) route simply because it also adds Spells Known to your list and lets do some metamagic goodies.
Eldritch Heritage is a feat chain. Improved and Greater are solid feats as well.
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Per this FAQ, Improved Eldritch Heritage(Arcane, New Arcana) doesn't work unless the spells chosen were already on your list to begin with.
Right, and the OP is playing a sorcerer. The New Arcana ability only allows you to pick spells from the sorcerer/wizard list anyway, so anything he could pick he could cast.
Now, is it worth a feat to add one spell (maybe two or three) to your spells known? Probably not.
Now, is it worth a feat to add one spell (maybe two or three) to your spells known? Probably not.
Especially since Expanded Arcana is a thing that exists.
Half-right; half-elves get a bonus skill focus feat by default. You can't get EH until L3 tho', that's true. Since you're getting the bloodline familiar this method shouldn't be an issue anyway.