Best Tattoos
+4Int -4Men , +4Wit -4Men, & +4Con -4Str
B Grade Gear
You can stick with C grade here, depending on where you hunt. If you opt for B grade just for a change of look, I lean toward Avadon over Zubei. At this level, even in Demon, there aren't any mobs your level that you can one shot, unless you are CDL'ing with an overenchanted weapon in Demon robes. Might as well use Avadon and kill as many as you can, as quickly as you can.
(and A grade eventually)
Dark Crystal robes. This is the point when you will group a bit more as an SH and possibly PVP more. But if you can't afford the helmet, just stick with what you used at B grade.
Weapon of choice and the SA's that go on them
At C grade if you get your hands on Demon robes and a sufficiently enchanted Ecliptic Sword or Whispering Death, you can one shot some mobs with the Magic Power SA. That will speed you through your early 40s.
Otherwise, when you get higher level -- and the mobs get much faster and their skills get more strategically engaging -- you will want an Acumen weapon.
Best skills to use for leveling
Pre-level 44, Hurricane. Body to Mind and Corpse Life Drain (CLD) should already be something that you use regularly. Clear Mind adds to that. Post 44: Deathspike. At 52 you'll get Curse Death Link. You can probably find a spot or two at this level where you can use this skill effectively. But it's not a must, and at higher levels, very risky. Play to your comfort level.
Sleep has been nerfed. Don't bother learning it as a top priority spell. Don't bother using it in dire moments to save your neck. Keep a BSOE handy.
Anything else that may be of use.
*Walk, don't run.
*Nuke first, ask questions later.
*Force yourself to group, so that you can learn the roles of other classes under combat situations.
*Don't go wandering around too deeply into the Sea of Spores without a phalanx of allies at your back.
*Craft your own shots. Don't buy them.
Best places to hunt
Anywhere you like. Sure, there are more dark resist mobs in game now, but for the most part, the world of Aden and Elmore is your oyster. This is still one of the best soloing classes in the game.