Firstly,_I like english very much,_and it's also very useful in my job. 

Secondly,_I want to (get to) know more people._While If you are good at speaking English and want to learn China Chinese, you can contact with me!_Let's make (more) progress each other together.

China = country

Chinese = language or adjective (for example Chinese food, Chinese people, Chinese culture,...)

Don't forget to put a space after punctuation ( . , ; ! ? )
I think, having to use English often at work is a great advantage for you. It's constant practice therefor you'll improve naturally. :)