I want to make a build that specializes around the Bound Dagger. I was thinking Sneaky Mage type guy, but what skills and perks should I actually go for? Help please!

All you really need is silent casting in illusion. It seems like you're making a nightblade so sneak, archery, conjuration, illusion, light armor and one handed.

Strongly Recommended
Conjuration - you'll want Mystic Binding (perk that increases bound weapon damage) [min 2 perks]
Illusion - you'll want silent casting, the muffle spell, and invisibility spell. [min 4 perks]
Sneak - At least the critical bonuses on the right hand side, all of them. [min 4 perks]

May Help:
One handed - damage if it isnt glitched for daggers.
Light armor - preference more than anything else, stamina regen really helps with power attacks though.
Archery - Bound Bow helps with range and is the most powerful bound weapon.
Alchemy - Additional damage and Additional effects that help with mobility

Some Notes:
* Bound weapons have 0 weight so power attacks take much less stamina
* Bound Daggers use one handed sword power attacks, this is really noticeable when dual wielding
* A Bound Bow can be found in the Fort Amol Prison, its in a bucket on the far wall and to the left. The bucket has a Lantern in it that (Lantern) is on top of the Bound Bow Spell Tome.
* Bound Daggers can only be bought in Solstheim.
* The merchant who sells you the spell tome is a conjuration trainer AND a follower so you can get free training from him.
* Bound Dagger have the lowest summon cost.
* I recommend NOT taking the Dual Casting perk in Conjuration.
* Muffle spam helps level illusion regardless of time or place.
* You can check your bound weapon damage if you have one normal weapon
* I recommend Joining the Dark Brotherhood

Sounds pretty good. I'll get going with it and, if I remember, report back how it goes tomorrow.