There have many skill point you can use when you are level your character, Here we will show you some information for your level(aika online gold). Use one point in Enervate at level 4(this skill is always optional: you can choose to level this one up or Hellfire after level 12. If you try to level both you might not have enough opints left. If you choose to level Hellfire then just replace wherever you see "Enervate" for "Hellfire" after level 12).
Use one point in Polymorph at level6, use one point in Lightning Orb and Enervate at level8, use one point in Mana Shield at level10, use one point in Hellfire, Lightning Orb and Enervate at level12, use one point in Mana Shield at level14, use one point in Lightning Orb and Enervate at level16.
You can decide if you want to have Aetheric Shackles at level17. Then use one point in Mana Shield at level18, use one point in Black Harvest at level19, use one point in Lightning Orb and Enervate at level20, use one point in Mana Shield at level22, use one point in Black Harvest at level23, use one point in Lightning Orb and Enervate at level24, use one point in Shadow Fall at level25, use one point in Mana Shield at level26, use one point in Black Harvest and Soul Trap at level27, use one point in Lightning Orb and Enervate at level28, use one point in Shadow Fall at level29, use one point in Lightning Orb, Enervate and Aether Flare. You should have 1 point left, feel free to choose any skill to level up at level32, then use one point in whatever you want at level33.
When you hit level 34 you should reskill in Aika. You can forget about Soul Trap for now. But we think most people prefer to level without it, it's your choice really. You can forget about Hellfire (or leave 1 point in there for the stun), since Aether Flare does about the same damage (or more) and has instant cast time and lower cooldown.