Barbarian Question (Diablo 2)

How does the berserk skill with the runeword vulture work? For example, if the bar has 400 damage, and the berserker gives + 1000%, then in the end there will be 4400 not counting the master? How much speed does a barbarian need on the bar? What is the best way to make a neck for a berserker? Does crit work and how? Does the crash work? Does the lich work, or does the lightab heal work? What's the best one-handed weapon?