Okay so I've messed around with Fencer for today and here's some short notes:
To class change to Fencer, talk to this NPC (see below) first, she is in the tutorial area.
Afterwards, you need to obtain 1 Harpy Flight Feather (Not Tradable)
Method A
Go to the Mountain part of the tutorial, there will be 3 Harpies and they drop the Harpy Flight Feather at 1% (I got it within 20 mins). If you go there at peak hours right now, there are so many ppl there camping the harpies / ks-ing.
Method B
Any other harpies that are not within the tutorial map will drop regular Harpy Feathers. You will need to collect 10 of them and then combine it together at the Capital (For Blue, the yellow soilder npc @ B2, beside a castle).
For Red, F6
For Green, E6
For Yellow, F3
For Purple, D6
(I am not 100% sure about these locations, I just took these off the fewiki site)
Takes around 30mins ~ 1 hour to get all 10 feathers
IMPORTANT NOTE: you can hunt the regular feathers with your higher level characters, and then transfer it to another character.
Method C
Buy it with Gash / Orb...
Afterwards, go back to the Fencer NPC with the Flight Feather. She will tell you to buy the newbie Fencer Sword. It will cost you 3 Rings, so make sure you have enough rings.
Talk to the guy to her right, select the first option and you should have the sword.
Talk to the Fencer npc again, select the first option and you will be a Fencer afterwards
General Notes:
There isn't much equipment for the Fencer right now... the level 16 weapon costs over 490 rings, which is pretty ridiculous for something that isn't even top damage. The def gear is pretty crap as well...
Since a lot of ppl are trying out Fencer right now, you will see 20~ish level 16~20 Fencers sitting at the crystal...so I would recommend playing Fencer some other time...
If anyone needs some regular Harpy Feathers, let me know, I have a few extras.