Alright well, to be completely honest here, it's going to be hard to play a stalker in pvp without top tier gear/expensive stuff. Since most of your gear slots are going to be taken up by dex gear so you can get ic, which is going to make you extremely squishy. :< But I can give you some suggestions for some gears that will help you level as a caster stalker and a start in pvp.
You're going to want either
2x sting gloves(+5 dex each), or 2x sting orlean's gloves.(+6 dex each)
a stem worm muffler (+5 dex)
hasty (Moonlight Flower) shoes (+5 dex and fast walk)
rocker armor (+1 dex) (Untill you can get to job lvl 67 and get all of your dex bonuses as a stalker)
Kaho
there's a lot of options for mid headgears, depends on what you want really
weapon wise using a bazerald for caster leveling can help. Or you can just use a bow or a dagger doesn't really matter.
As you can see, you waste a lot of gear getting dex.
a more expensive and ideal gear set for pvp would be
2x celebration rings or 2x sting brys
a raydric and devi garment of your choice. I like using wool scarfs
dl sleips
a wind marc, ghostring, evil druid, pest armor
kaho
mid could be a number of things, I generally use an orc hero so I don't stun.
gtb and toad valk
and a sherwood. :<