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Skip either the 12K or the coticule.
One won't add anything after the other.

I have a nakayama asagi. A natural Japanese stone.
I wouldn't recommend a beginner to buy one of those.
Until you can get good shaves off an 8K stone, you should not use anything higher, because it...

Yes, it will. :)

Your finishing stone is the last step on the ladder. For the purpose of clearing the ladder, it doesn't matter if you get to the top rung by taking 1, 2 or 3 rungs at a time.

I...

Dude no.

If you hone razors that have edges in ok condition, you only need a 3K/8K or 4K/8K or a coticule for example.
If you have the intention of honing razors with dinged up edge, you could...