This is my first leveling guide, went through this with my old shadowknight and was 65 in little over 3 days.
Levels 1-10:Tutorial is the place to be. I usually will talk to Arias and go to PoK, grab temperance and low lvl DS pots(distillate of Skinspike I or II) You will plow through tutorial with these. Don't forget to grab spells =) Of course do Charm quest =)
Levels 10-20: Cresent Reach, upgrade ds pots if possible to III. Kill gnolls and undead, and a good grind spot is the puma cave. fast repop time and easy to kill. Stay in CR until about lvl 20
Levels 20-~38: Blightfire Moors, amazing exp, again stick with ds pots they are awesome, always have temp. Start off with snakes and rats at entrance to CR then move to gnolls. Once gnolls become green or light blue move to wasp area by Stonehive zone until ~lvl38. If you need equipment, do some newbie quests. Plenty of them in this zone!
Levels 38-~46: Stone Hive, Hotzone great exp! go into castle and plow hallways, always have Distillate of Skinspikes VI or so and temp. When 46 get virtue. If Stone Hive isnt for you, try Dulak's Harbor =)
Levels 46-~57 or lower 60s: Crypt of Nadox, Awesome exp, can usually find a good group here and the occasional Powerlvl. This is where you can stop useing DS pots =) When you ding 57 you gain access to another hotzone called Bastion of Thunder or BoT. You can proceed there or stay here for AAs and such. Cool Defiant gear here also, as with anywhere else =P
Levels 60-~65: BoT all the way, grouping. If the zone is full, try grouping with a high lvl toon in Halls of Honor or Plane of Fire. If you want to grind out AAs, nadox is the place to be at low 60s. If you can solo well, i would say go to The Hole, buy some shrink pots to get in tho.
Got to 65 with sk in 3 days. I just made this guide (First one) waiting for server to come up, need feedback =)
Here is a list of the hotzones:
Level 20 North/South Ro
Level 25 Solusek's Eye
Level 30 Blightfire Moors
Level 35 Stone Hive
Level 40 Dulak's Harbor
Level 45 Skyshrine
Level 50 Akheva Ruins
Level 55 Crypt of Nadox
Level 60 Riwwi, Coliseum of Games
Level 65 Torden, Bastion of Thunder
Level 70 Ruins of Illsalin
Have Fun! Welcome Back any Returning players!