For a level 99 zerker best equip (aside from the stuff you would use if you farted cash) would be (in my opinion)
2 glorious ohkeros rings
Glorious hwaridun necklace
Helm, armor, boot, gauntlet of seshi
Greaves of nuendo with a bonus resistance stat
In your case, starting from scratch, a good goal would be to get a full nuendo armor set, a karkaen necklace and some shuta rings or blode rings.
With that stuff the leveling will be easier.
Check out this website:
All the armors and uniques can be found there. Also how and where to get them.