Do embassy require any document of my college & China company except invitation ?

Kind Attn.: Ms. Julia

Dear Madam,
Glad to get your reply. Your information is very useful for me. Can you tell me what sort of document i have to attach with visa application form ? So that i can collect from Chinese company & my college.

Please tell me which visa category might suit to me for internship.

Thanks & looking forward to hearing from you.

Best regards.
Imran