Warden (magden) pvp main, but I’ve never used bows. There’s just so much more bang for your buck using a Master’s ice staff on a ranged warden these days (12% damage bonus; 20% increase block dmg), as well as brittle, & chilled passives… it’s just really hard to imagine how much you’d lose running a bow.
Wish I could help! The frost staff bonuses have really limited/pigeon holed ranged warden, if you want to be competitive in pvp. It’s too bad, really.
You could always try Bow/Ice Staff. HA! That'd be pretty cool actually.
As far as sets go... I mean Warden is in a pretty good spot for PvP. My last warden was very successful wearing rallying cry, Hrothgars, balorgs, Markyn, and 1 piece trainee. Nothing fancy in other words. I don't think you'll have trouble finding sets to wear but you may struggle to figure out what skills to use on a ranged build.
I used to run a bow/bow warden. Honestly, it just isn't worth it anymore. I mean, it's fun to play every once in a while but not competitive at all. I used to be confident that I could fight most 1v1s and if I got overwhelmed I could use my speed and shimmering shield to get away. Speed is something everyone has maxed out at all times now and shimmering shield is a fraction of what it used to be in terms of defense.