i would like to stay as well as work in China for 2 or 3 month. Which procedure might suite me? Which type of China visa do I need?

Hi,This Imran student of Dhaka Commerce College Bachelor of Business Studies (Hon's part-3)& student member of American Association of Textile Chemist & Colorist (AATCC), NC, USA & Textile Institute , Manchester, UK. I will get 2 month vacation after having my 3 rd year final exam. One year remain for completing my under-graduate course from here. During my vacation i want to job in a Chinese company as Internship . I already have some experience & got some training course & that Chinese company know me well. So there is no problem from both of our side. My major subject of study is Finance & Banking . Chinese company will take me for International Trade & Outsourcing activity. Now i want to know what sort of documentation China Embassy require for me for 2 month staying & engage there ? How can i get China Visa as its too hard for Bangladeshi student , so i get preparing myself very well.

Please let me know about these...
1. Visa Type
2. Visa Documents
3. Invitation purpose that stated on .
4. Purpose (Job/Internship/etc) Cause my graduation will take one more year. its 4 year course & i done only 3 years.
5. Who have to bear my cost for staying in China ?

Thanks & looking forward to hearing from you.