When you shift into first gear before you're completely stopped and it clunks, is that bad for the bike, or just an annoying noise?

every bike does that, at least every bike with a wet clutch, i dunno about the others.

Sorry if I was unclear, but I know that every bike does that, and I was wondering if it was bad to do that, or if it doesn't matter.

no its normal and not a problem.

sure doesnt sound purdy tho does it