Well, lets see what comes up in my thoughts:
Code:
Level 1
Race: Half-elf
Class: Warlock - Star Pact
Abilities:
Str: 12
Con: 16+2
Dex: 12
Int: 16
Wis: 10
Cha: 8+2
--OR--
Str: 8
Con: 16+2
Dex: 10
Int: 16
Wis: 12
Cha: 12+2
Skills: Insight, History, Religion, Bluff, Arcana(Arcane Initiate)
Feat: Arcane Initiate, lvl2: Improved Fate of the Void, lvl4:Novice Power
Languages: Common, Elven, Primordial
At-Will:
Eldritch Blast
Dire Radiance
Encounter:
Thunderwave(Dilettante)
Scorching Burst(Arcane Initiate)
Vampiric Embrace
Daily:
Flames of Phlegethos
Lvl2: Ethereal Stride
Lvl3: Frigid Darkness
Lvl4: Replace Vampiric Embrace with Wizard's Grasping Shadows(DDI ClassActs - Wizards on Illusions)
Lvl5: Hunger of Hadar
Increase Con and Int for the two stats when leveling. If you don't plan on taking Armor Proficiency: Hide or Chain(Eladrin Armor), then you can switch the Str and Dex scores with Wis and Cha.
When the Novice/Acolyte/Adept Power feats come around, get them if there is a Encounter/Utility/Daily power from Wizard you definitely want at that level. Otherwise, hold off and retrain into them when needed. I would advise taking the Acolyte Power at level 10, and trade in your choice of Warlock lvl10 Utility for the Wizard lvl10 Utility Blur.
For Paragon Path, ignore the Warlock's Doomsayer and go for the Wizard's Battle Mage.
For an Implement, aim for having a Wand+? around as your main foci as they work for both Warlock and Wizard, but a Rod of Harvest/Corruption is also advised to have for benefits. A Rod of Harvest allows you to store a Fate of the Void Boon for use later, +1 or +2 on an attack roll helps insure you will land a Daily.
Star Pact was chosen over Fey Pact due to the accuracy bonus it can give. With 16 Int and one activation of the Star's Pact Boon, you are literally just as accurate as a Wizard who went with 20 Int for one shot of which ever MCed Wizard spell you choose, after you get Improved Fate of the Void. So with a Rod of Harvest, you can use a Minor Action to release a stored Pact Boon as needed.