First notebook entry: Introducing myself

My name is Zhangwei. I was born in Xuzhou, Jiangsu province. I am twenty-seven years old.
I want to learn English (including: written English and spoken English*) 
There were two reasons why I want to learn English. The first: for my interests. I love English. Another reason: for my work. I want to change my work. In our company, as a leader, I must be able to speak and write English, so I want to learn English.

*Oral English and Spoken English mean the same thing

Also, I didn't know what you were trying to say when you said "as a profess man" do you mean "As my profession"?

First notebook entry: Introducing myself

My name is Zhangwei.  I was born in Xuzhou, Jiangsu province, China. The age was I am twenty-seven years of age. 1 old.
I want to leaned learn English (include of :oral english, writing english and speaking english) as a profess man. so that I can speak and write like a professional.2

There were Two reasons:3  that why i want to leaning english .The first : for my intrerest .I love english .another matter :for my work the language and .I want to changer my position at work. In our my company,  as a leader must be speak the language fluently and write well.  speaking and write english for a skilled,so i want to leaning english.4

1.  The simplest way of saying is "I am 27 years old."  However I am writing this more formal way to set the tone of your essay as written by a leader would.

2.  Just my personal opinion. I suspect that it is more the case of projecting a powerful image to awe your subordinates.  This is because the prevailing perception in China is that if one speaks and writes good English, he is seen as highly educated and therefore knows what he is doing and should be in charge of things.

3.  I left out the customary leading phrases.  As a leader, you don't need to them.  Just state your reasons as a matter of fact.

4.  A leader just barks out orders.  No need to justify his reasons.