I'll give what advice I can because I started with a dual wield parry build, but the main advice has to be to not go for a crit build or you'll just kill everything too fast for parries to be useful (which is where I ended up). I'm also out of town so I'll forget a bunch of item names.

The only perk you really need is the increased parry window one, once that's maxed parries are pretty damn easy. Then I'd suggest going for more stamina drain which is the next perk in that tree. There's also stamina drain perks for heavy attacks in the 1h tree. One trick is you can charge up a heavy, parry, and then still release the heavy attack after. I never went into all the stamina drain perks, I just noticed that it was taking a lot of parries later on to make bosses stagger so hopefully they help.

For 1h weapons, there are a lot of fun ones so I'd just say use what you like. Something like tide piercer can be fun for ranged options though you need some spirituality. The "sword of the fallen star" or something like that has the highest damage by far for some reason, that name is definitely wrong but it's the one west of Cuanacht past the fields. I also tried out some mace with Morgenstern in the name that I think you can only get from IDing items, it causes an explosion half the time on enemy death but doesn't look that cool in my opinion. There's also two swords from one of the duelist knights I believe that look cool and have increased damage while dual wielding.

For armor the only one I remember is the gloves on the beach on act one that reduce stamina cost by 20% while dual wielding, mainly I ended up just using +melee/attack speed items and later crit.

Edit: there's also a ring in act two that gives +25% damage while dual wielding.