hi, i wanna ask how to earm many Qi points?

How to earn Qi ?
Well, basically by playing in Multiplayer.

Qi is the amount of fights you got in Multiplayer.

By earning Qi, you will unlock restricted items, like Elf, Pure etc...

So yeah, fight now !

and does it needed to buy TC or i can earn it in game multiplayer?

....
*Thinks really hard and reads starioshkas's sentence over and over again*

Mm

You can get 10 TC per win on official servers - Beginner, Intermediate, Semi-pro, Blackbelt.

lol really it's hard to read my sentences that's from old times.

No, you don't need Toricredits to earn Qi.