When I first pvp'ed on my hunter I read some stuff and tried the most mana efficient route on my hunter (solo).

This ended with me being dead more often than not. I realised I really need to be doing everything I can to keep the enemy off me, so worry less about mana and up my dps.

I also found that hunter melee can do a decent chunk of damage too.

I used a macro something like (working from memory).

/cast kill command

/cast wing clip

/cast raptor strike

/cast mongoose bite

If something is in my melee range then I spam that button, with a bit of gear you see some nice big chunks of damage coming up as a result.

It also allows you to get on your toes if need be after wing clip is applied.