Level up - Don't know still need to think about it

Um.. 9 slain in a post, was it all at once? Because that is unreasonable at low levels.
If you take your time to slay between each. Um... time will vary from like 30 minutes to an hour depending on the circumstance of waiting, spawn times and the fact that resources are getting limited in the first floor of SAO. Possibly more than an hour due to the waiting.

(However, Umichi at this point is so over-powered he takes on like 20 at once one shotting? I don't know. I think I went overboard, need to tone down. But his like level 13 compared to the Ruin Kobold Troopers at level 6, and he has an Anneal Blade, best weapon on the lower floors, enhanced to the max.
.....
Yeah my character so is not balanced. Lol He will balance out later, probably.)

Anyway, I can only say if I have a problem with your post after reading it. Generally speaking things should be fine

In terms of the martial arts, probably won't specialize. And would need to wait for second floor to get it anyway.