Where can I find an item with the fortify 1 handed enchantment?

Stuff like that is pretty rare and worth a fortune. I'd try the peddlers in each hold and village

I got a ring from the chicks with the clothing store in solitude. With the enchantment I do over 120 dam. And still have to Max onehand and enchant 4/5 in both cant wait to hit 80 in both as it is now enchant of 73 I can add 32% more dam with a grand soul gem 22% with greater and you can do onehand enchant to rings,neck,gloves, and boots!!!

Yes peddlers are vendors. Old term for merchant. But I found a pair of Ebony gauntlets that fortified one-handed by a dragon mound. I'd be prepared for a hard fight and worse trip to the mound

Do you have to be a certain enchanting level to upgrade gauntlets to fortify one hand?

Check to clothing store in Solitude. It's called Radiant Raiment. They usually have appeal with good enchantments. It's a good way to learn some useful enchantments early on. Aside from that, try revisiting some of the dragon lairs you've been to. I believe that the large chests get refilled every 2 days or so. Don't worry about the dragons. I believe that re-spawn every 2 weeks.

Radiant Raiments or bits n pieces in solitude, also can check Bierond for a gauntlet.

I find them constantly in bleak falls burrow every time i start a new game and im lvl 15 when i do it if it helps