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If so then light armor will work far better due to the passives.
If you ARE a magicka build you have two options...
A regen build: Seducer / warlock stuff... but if you use both then while you wont run out of magicka, your spells will hit like a wet lettuce & be very weak.
A spell power build: Stacking spell power on as much gear sets as you can..... High DPS, but you need to use things like cost reduction glyphs on jewellery so you dont go out of mana.
While levelling... at V1, use a combination of the two..... 4 piece Magnus gift (crafted) is great as it gives you a bit of everything (Max magicka, magicka regen, spell power). Warlock is good at V1 as well.
In fact... at V1 I'd go:
Rings & neck: warlock
Armor: 2x warlock (To make it up to a full 5 piece inc jewellery)
4x Magnus gift (see above)
weapon & 1 armor piece: Torugs pact.... for the spell power.
This will be a very strong combination of magicka regen & also includes a couple of spell power buffs too so will hit a lot harder than just a Seducer/Warlock combination.