Low level help
For the first few levels (e.g. your level), Scepter is probably the easiest, since it generates more clones than the other weapons.
After you get to level 7, you can swap between two sets of weapons. Most weapons are fine for PvE for all builds — and you should practice all of them. The only weapon that is somewhat specific is Torch. You probably want to avoid Torch until you get more experience.
Generally, Greatsword and Staff are the easiest weapons for PvE because they have the widest array of AOE / multi-target abilities.
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