If your just looking to grind, your definately gonna want to get decayed, Curse breath which are your DOTS, these give you zerk fast. You want to get your nukes which are blood flower and Death flower. And if a giant spawns it helps a lot to debuff it, in which case you need to add disease to to so that the debuffs work, the skill to add disease is called vampire touch. Then you just add your debuffs which are all under your raze book.
For pvp, you would need a lot more skills, which is why a lot of people dont always finish with their warlocks cause the need a lot of sp, and i mean a lot.
Hope this helps some, if you have any other questions let me know.

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