Half dragon ninja!!?

[Arashi Kirito]

Haha, so as a couple of you may have seen my previous threads, I'm very inexperienced in all factions of d&d/Pathfinder. Here are a few questions I have about ninja's/my build goals:

First off, is there a claw-like weapon in pathfinder? I'm aware that half-dragons get claw/claw/bite attacks and was wondering if it's viable to have a claw weapon specially designed (at an increased price, of course) to kind of reinforce/potentially increase claw attack damage? Note: this is for homebrew and not standard.

Also-From what I've seen, duel wielding comes at a price of accuracy (unless equipped with certain feats). Since a claw is his natural weapon, would this still come with those impeding modifiers? And I believe I've heard that natural attacks have a bonus to what you role to hit?

Also, any advice on feats/abilities/ninja tricks would be great. Seeing as a half-dragon gains a +8 str bonus I'd like to combine that with multiple attacks as much as possible. While my dex is my main focus as far as using my highest roll on it, with that str modifier my strength is still larger than my dexterity so feats to utilize dex in str's stead would be entirely useless options.

(should I multi-class with monk bc they get a ton of hits or no?) I'm not too familiar with how multi-classing works. Is the experience gained split evenly between the two or how's that work?

[Threeshades]

When attacking with multiple natural weapons on a full attack you always attack with all of them at once, no matter how many you have. This isn't two-weapon fighting, so you don't get penalties to your attack rolls or damage, unless any of your natural attacks are secondary (they are usually marked as such) or you use them together with a manufactured weapon.
Secondary natural weapons incur a -5 penalty to their attack roll when used with other natural attacks.
When you use natural weapons together with manufactured weapons, your manufactured weapons attack normally and you may use at maximum one natural attack which also incurs a -5 penalty, no matter wether it is secondary or primary. The natural weapon used must be free. You can't attack with a sword and a claw in the same hand at the same time.

Both of these penalties can be reduced to -2 with the Multiattack feat from the bestiary.

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When you multiclass you simply choose each level in which class to advance. You don't have to split any experience or anything.

A word of advice: Multiclassing often results in rather underpowered characters, you need to know well what you are doing, to make it work well.