Filling them is a piece of cake with Conjuration and Bound Weapons. Just buy dozens and dozens of petty, lesser, and common gems. Save Black Gems for your own Enchanting (since humanoids are always Grand Souls). Grab every iron dagger you find on enemies, because Banish enchantment sells the best, which makes it easy to buy more empty gems. It quickly starts paying for itself. Use Absorb Health/Stamina if you don't have Banish yet.
Bound Weapons do a lot less damage than properly smithed weapons, but situationally, they are far more powerful:
- Soul Stealer is awesome. Every hit recasts Soul Trap, and the duration is long, because it is the spell version, not the enchantment version. Find some wolves, find some Horkers, undead, whatever.
- But the real strength in Bound Weapons is the Oblivion Binding perk, taken right after Soul Stealer. It is the strongest anti-summon weapon in the game. One glancing hit. Even a misfired arrow. The spell Expel Daedra doesn't work on anything comparatively. The spell won't even banish a frost atronach. You do need to be careful, because it will banish anything you summoned too, like with a stray arrow (happened so many times...).
You're better off using Command Daedra on enemy summons. They're always seem so baffled when their Frost Atronach turns on them.
But yeah, I've got 100 Enchantment, took the Extra Effect perk, and now all my Archmage's gear is imbued with an insane magicka regen rate, as well as all the other enchantments I used (fire resist, magicka capacity, etc.). I remade new versions of all the clothing except the Archmage's Robes. I also have a ring for every type of combat I might use.