Old player returns but not sure with skilltrees (demo/nec)

Hi, i have a necro and a demo with old skill trees, i played in 2009. Now i wonder which builds would be the better ones in PvE/Raid. I would be glad if someone can give me tips or finished skilltrees and ill check that. My nec is mainly on summoning and the demo got the fire skilltree. I would be glad if someone with mage exp can help me out a bit. tyvm