One/three advantages (no obvious ones, be creative):
1.Shuriken and Kunai can be thrown with this to increase they're speed and power
2. Can deflect incoming projectiles
3. No hand seals and could come in handy as a defensive maneuver
One/three disadvantages (no obvious ones, be creative):
1. Probably can't stop large projectiles
2. Would cause a small fire to turn into a a blaze possibly harming yourself
3. I can't really think of anymore as this is a good jutsu.
How you would use it in battle: Well, I'd use it as a way to either speed up my kunai causing the opponent to react quickly to it or I would use it to push an enemy back. Can I use this to evade?
How you would counter it: Well, depending on whether or not my opponent threw kunai with it (assuming they do) I would use a B-rank fire jutsu, aiming to increase the fire's potency and then follow that up with the jutsu where I breathe in and send the fire toward the user in hopes of incinerating him.
How you perform it (with as much detail as you can): I would start by grabbing a few kunai from my ninja pouch. Then, as I channel my chakra into my arms, I bring my arms out and slam them together. As my hands would clap against each other I would release my chakra into them, compressing the air and sending a shock wave from the clap at the opponent along with the kunai being thrown directly before my hands clap.