This is for Eir?
It's hard to explain 1st hit for Eir for me (I'm used to having >>AS) but I'll try.
Ok, so basically you will mostly use AA as your first two hits. Basically, press AA and if the opponent dodges it, quickly move out of that spot and try to hit him with AA again. Just repeat until you hit him (that's how I played Eir anyways).
Usually you need to watch the person's movement patterns before you can predict their movements. It takes quite a bit of PvPing and understanding of how the other class normally PvPs.
Try watching PvP matches. I know that UnknownxOne, testing1 and a bunch of other Eirs are good at PvPing so you might learn a few things if you watch them.