Well then i will try to help:
1. Caster is stronger. But the perfekt ultimate dps would be melee caster (cuz meleestrikes have a diffrent cooldown than casts and pet you can hit beetween attacks but to me its just not worth it
)
2.well on a complete melee paired can be nice for clout combo but meh 2 hand brings more instant dps cuz stroger hits but you should go caster anyway so its completly up to you (i prefer a 1 handed so i dont have to upgrade 2 weapons cuz i prefer to have more defense in pvp)
3.thats pretty much the same as static stacks
when you have no stacks at all your first melee strike will generate 1 stack of cambat wit and shred will always give you 3 more of it afterwards, every melee strike also has a chance to grant you one later on (at least thats how i saw it). the maximum amount is 8 stacks and every stack pushes your melee damage and if you have the rubees also your damage on shred.Last but not least it gives you nice little abilitys for example there are 2 rubees which can just be used whith combat wit (instant bee swarm and a fucking long speed potion) and its lowering the cooldown on barkshield for every stack.
4. well not sure what kind of build you wanted so i just post an astral (PvE) one
thats mine
http://www.en.allodswiki.ru/calc/#!5!133…H!sndzcwn/EJSTL
but cuz i think you wont have enough rubees to build it here is a more realistic one for a new player
http://www.en.allodswiki.ru/calc/#!5!133…H!sndzcwn/IFBMJ
with this build you have pretty much everything needet for pve: you got cc,heal,dps and a little bit of defense
some strange things in this build are probably the boar blow (its for astral islands where you have to cc some mobs cuz they choke etc) and the ferocity (i have a scout in my grp and his regg is better than mine).
but if you prefer energy regg something like this may be better
http://www.en.allodswiki.ru/calc/#!5!133…H!kndzcwn/UHPTL
well hope this is a help somehow