Toribash
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:

https://www.youtube.com/watch?v=9CDGyUwwTs8

and find some sparring server's ingame to practice on.
Connor's the name, winning's the game.
http://connorftw.deviantart.com/
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.