Well your skill set will be:
Conjuration, Restoration, Blade, Block, Heavy Armor so far.
Add Restoration and Illusion...you got it. Illusion is arguably the most powerful school of magic, with many many great spells. Coupled with Conjuration you can lead a small army. Restoration is just as much of a damage dealer, as it is a healer. The Fortify can buff out a warrior, to tank in a battle, right along side the conjured and commanded buddies. The down side, is that armor will drag your effectiveness of spells. The Command spell will become less useful at higher levels. Still Illusion is happenin'.
These, being your Major skills, will raise faster. That doesn't mean you cant use minors. Armorer raises fairly quickly. You can afford to keep it as a minor.