@Stravix the following link should help tremendously to level your character.
IMHO if you are wanting to farm gear to create a PvP build, you will 1st need to level your character & then hike floors so that level specific gear will drop. Your Legendex will show you level & difficulty specific gear.
Since you have one character I agree w @Zombikiss that aftermath is a good early build since all 4 items can drop at floor 40+. Meteor was recently nerfed but it is still a good way to get bang for your buck needing to kill mobs quickly. Try to get a Nadrogi amulet by farming epic+ nme at floor 100+. Best way to farm Nadrogi is crafting a Hunter ring (rebirth flight quest fortune) & using it on shrines so that epic nme is generated. Until u find Nadrogi, Astral Vindication is a decent ammy & drops at floor 100. Astral Communion for head is good early option, or you could go with Wanderers Cap for speed & exp.
Here’s the aftermath build I used to get my 1st wizard started. It even has a farm build variation. Don’t worry about some of the gear having obsidian affixes (unless u already have some obsidian to use), just max out meteor skill to 40. Also max weapon damage on both the MH & OH. Then bombs away!