Alrighty, lemme get some responses for yall:
Might:
You can find the chance to hit/be hit formulas over in the statistics forum. It's based on attacker AR and level vs. defender defense and level, though you can find the exact mathematics for it over there.
As for defense/blocking, I can't recall offhand which comes first, though it doesn't really matter, the math comes out the same regardless. If you have a 50% chance to be hit and 75% block, and get attacked 1000 times:
Defense first: 1000 goes to 500 from defense, then 75% of thoes are blocked if they make it through, so 125 hits.
Blocking first: 1000 hits goes to 250 making it past, then 50% of those miss, going to 125.
As for conc abd blocking: conc still blocks as normal, but still retains the uninterruptable mod, so you won't stop swinging until you let off the click. Pretty awesome, ain't it?
Iceball:
I tried the cracker out a bit back in the day, and it was pretty nice overall; the ias and crushing blow rock, along with all the defense bonuses. The damage is kinda low, even upgraded/ethereal, and the lack of a shield hurts a lot since you lose the base defense/blocking/resists/mods, but it's still a pretty nice weapon to fool around with.
tl:
You should be able to hit fine as long as you pace yourself so you're close in levels to your opponents. If you find yourself having a lot of trouble, Angelic rings/ammy will remedy any ar problems you're having, and using battle cry can make life a LOT easier as well. As for lower-level gear ideas, you might want to check the eq sections in the guide for ideas.
Geist:
A shield will make help you survive much better, and give you extra defense to capitalize on; as I state in the faq, I always advise using one, though it won't help you much if you don't have enough dex to keep the blocking up. As for a sword, i typically don't use them two-handed, since polearms and maces are much more powerful (i don't use them one-handed either, for that matter, since axes are better in that department), though things like Doombringer, Grandfather, and BotD cb are very powerful indeed.
Alright guys, sorry for taking so long responding...like I said, really busy week in general.
-Hal