For a new start

I am Monica from Zhejiang,China.
After graduation,I came to the south of our country to take a job as a saleswomen, it's about half a year already.

As a girl woman, it's hard to be interested in electrical and mechanical things, our product is fasteners, and to be a greenhand in sales is quite a challenge to me.
I have received a met one guest from India, but it was such a hurry short visit that he didn't stay long, and the time is was not enough to let me show him more. At last we did not keep in touch after several mails.

Now I want to learn more to encharge myself in advance, so I could can be much very skillful in the business. I'd like to make more friends all around the world, please  do not hesitate to conmmunicate with me if you want.

Let's improve together, my mother tongue is Chinese. If you want to know more about China, or visit our country, it  would be my pleasure to keep you company, or give you suggestions.

Notes: some very minor spelling mistakes. Just like I make all the time when my fingers type faster than my brain :-).

With punctuation marks like commas (,) , full stops (.) , always leave a space after the mark and before the next word. Such marks indicate pauses for thought and should be evident if you ever read an English text aloud.

I am not sure that I understood this sentence At last we did not keep in touch after several mails. Did you mean "Finally we lost touch after several mails" ?

With this fragment " encharge myself in advance" did you mean "prepare myself in advance"

I have replaced the word girl with woman. A number of Western women regard the usage of girl as someone demeaning. As you are 23, you are regarded as a mature adult, so woman is better usage. I think that in some way, it would be more empowering  to your self esteem as well and that would be a very good thing in sales.

Your written English is very good.