Use 108 if you have it. Use SM and get M and use that too. As you get marbles you can eventually buy STR and DEX to make the maze slightly easier. I'm recommending STR and DEX because you don't care about how many marbles you earn per run. If you did care, you should use some runes from 100-104 instead.
Tabula doesn't really matter, although M02 can resonate both STR and DEX.
Job runes can help as well (read their descriptions to determine if they will be of any use).
I recommend switching to melee as soon as you can (some people use barrager instead) and then change to mage right before the boss fight.
You are correct that anyone can get the non-CC belts. When you pop the crate, you have the option of taking the belt out or leaving it there for someone else to take.
Your job doesn't matter as long as you or your mule can toss a couple of Cure IIIs in an emergency.
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