guild stash is league based, so it will not matter. They said they are doing it like this. Breach SC Breach SC SSF Breach HC Breach HC SSF. So it will basically be a new league and not connected in any way unless you opt to transfer the character to non SSF league.

first you gotta find a decent base and then u have to link it too. Life based can just grab a random 5l and craft a life roll on it and run with it until +t10s easy. A tabula carries you pretty far too
Also es builds always have the problem of getting stun avoidance/immunity and you can hit quite a wall if you get unlucky. Ofc you can just farm lab til you get ench on boots or hope to get valyrium, eye of chayla or kiaras drop but you might spend quite a while trying to get one..

Life is so much easier SSF

Idk. I'd just play elemental flame blast totems kappa

You would obviously run life to start and craft the es gear as you go