Making a sorcerer character.

Gonna use the longsword as my melee weapon.
Possibly might take it to enchanted, or leave it at +15 so I can use crystal magic weapon.

Anything I should know so I can make this character all-powerful?

Crown of dusk will more than likely be a must since I never wear helmets unless it goes with the build.
Also, Bellowing Dragoncrest Ring will be a must.
As for a catalyst and whatnot... Idk. Suggestions?
Might keep this character under 100. Maybe take it to higher levels, idk.

There's a lot of ways a mage can go. Before you plan your stats and gear, you should figure out the balance of casting to melee you want to use. Some people just want to use the Moonlight Greatsword and cast very few spells, so they need a lot of endurance, armor, and little attunment. My own mage has almost base endurance, but has 50 attunment, and is a pure caster with Velka's Rapier for last resort melee fighting. Or you could go halfway, balance casting equally with melee fighting. Once you've decided that, the rest will figure itself out.

I started a glass cannon a few days ago. The only issue is going to be Seath, so I would co-op for that. Enchanted +5 is pretty good, as well as moonlight sword later on if you can get it. Also power within wrecks major havoc when you get the more powerful spells.

If you want to invest less into STR, you might want to use the Moonlight Horn. It's a spear with only magic damage and as a result bypasses the shields a bit because they don't block a lot of magic damage!

Idk I dont like the horn that much. I was thinking the longsword + crystal magic weapon when needed, and the rest just being spells all over the place. Perhaps Pursuers or such?