So I'm planning on having d6's with the following break down:

X, A, A, A/B, B, C

I don't know enough about probability and multiple dice, but I can't just add the percentages up together, can I? Something tells me it's a lot more complicated then that

I would very much appreciate a crash course, or a point in the right direction. And you'll have my unending thanks. :-)

That was very helpful, thanks. :-)

I'll have to work with that website a little more too. Thank you. :-)