It's unlikely an expert such as Mocucha, Marrez, Binklawz etc. would be willing to devote to teaching you to spar. I would watch Mocucha's video:

and find some sparring server's ingame to practice on.
Connor's the name, winning's the game.
You should just play lots of joint related mods, like lenshu or Ninjitsu. After you get used to those, you can find a friend who wants to learn to spar, and practice together.