Durburz is higher points value than that, I think. It will need a little adjustment.

Well of that right, I thought he was the same points as Druzhag.

To make use of that 17points (which is a lot) you could switch some goblins for uruks, or if you don't mind spending £8.20, swap 3 Scouts for Feral Uruks, also your goblin spears can support the scouts, so you won't be needing as many shield goblins.

Just my opinion though.

I think that would be a good list, I can't give you their stats but Feral Uruks are good.

They're of the heavy hitter variety, not as powerful as bezerkers of course, but you'd need and extra hero, so stick to feral uruks

Well Ugluk might not add much since you've already golt Lurtz, but 3 extra might could be helpful, it depends if you prefer that many. Two or three heroes is probably the way to go.

That might work quite well, you've a nice battleline, some archers with guards, which would be good deterents too, and they're unlikely to flee to courage like others and a hero, do you plan on vollying with scout and goblin archers? I think that it's not unbeatable of course, but you could definately do well with this list and plan.

Vollyin is a special type of shooting, you need at least 10 archers with the same shooting weapon eg Orc bows so both goblinns and uruks can fire together.
As for the gobbos, use them as a screen and to guard flanks of your battleline and use their spears to support your uruks and Ugluk.
Keep the troll screened so it's harder for archers to kill and then use it to attack groups of enemies, don't let it get force fed one enemy a turn, I made the same mistake with a a Spider Queen many years ago and lost.

The firing normally is well normal, but when vollying you bick a single target for them all, which has to be within half their normal distance and twice it I think, so it would be something like 9-36" range, they only hit on 6s, all models within I think 6" of the target could also be hit, in this way you can kill targets wearing elven cloaks etc, in the OR book, there is a section on it near the wargear section, I'm not sure if it's in the MoM one though.
Yes, Durburz should be with the goblinns for his extended stand fast that only affects gobbos.

I wish you look, may the hordes continue to swell, may the night grow long and may you be victorious iin your quest!