quest defence to 42, make sure to do all the quests that give defence that are required for barrows glove so that in the future if you want to get b glove, you won't go past 44 defence.
after that it's pretty straightforward ...
-do lunar's diplomacy for vengeance,
-get 94 magic
-get 90+ range to be effective
-get void + possibly mage helm if you want to do some hybrid
-possibly do some NMZ and get yourself an archer's ring (i).
after that for gear to pk with:
I find that blowpipe > acb when it comes to fighting 1 def pures
but acb > blowpipe when fighting zerkers in my experience.
obviously, if you have the money, use dragon darts in your blowpipe (alternatively run darts for more cost-effective pking)
as for bolts, i normally used a combo of diamond bolts (e) and dragon bolts (e) for special. Alternatively you can use broad bolts and dragon bolts (e) combo although less effective on zerkers.
as spec wep you don't really have a choice: dark bow and dragon arrows, that is pretty much all there is.
As a void ranger, your main source of kills will come from a veng/high hit combination
very rarely will you KO solely on your hits (although it does happen sometimes)
so the key to pking as void ranger is to time your veng so that it gives you the best opportunity for KO (i.e. don't veng if you see that they are full hp, try and wait for when they are maybe at 50-60% health)
That is all, keep in mind that is just my 2 cent, others may have different opinions!
Have fun!