1. Zerks are best PvE wise no matter what. Any gear will do, however, I do recommend Legacy at least. 2 handed weapons aren't exactly preferred in my opinion.
2.Err, I suppose you could craft and sell weapons. Same with farming rep items.
3. At level 31, you should be able to solo PC. It's relatively easy.
4.What I personally do is use B-Scrolls till +6, then farm A-Scrolls to +9 with, however, I do normally require a few Greater Blacksmith Repair Hammers.
5. Powerleveling is only not allowed in level-locked locations such as Deepfathom and Prism Island.