Hi. I have no much experience with the live games, but I would like to start play it. I am still learning english, and have some problems with poker terms, names, all this shortcuts and sayings.
How important is to know them to play real, live game. I have no problem playing with friends, but how it looks on professional level? Do I have know all terms and names that a used by poker players?

To be honest I don't know what terms you truly need to know in order to play the game other than: all in, call, check, fold, and raise.

The more you play the more you will learn them.

It is not necessary to learn all the the poker language. I have seen players make the WSOP Main Event Final Table and not know them.

You should be fine once you know the basics like bet raise call.