After getting invitation letter what will i have to do? I will attend conference in Beijing.

Dear, according to your information, you should apply for F type, which requires valid passport, application form and recent photo, invitation letter and verification letter of invitation, your company's supporting letter, bank statement of last 6 months. Plus, if you go to China for the first time, you should need to provide local police clearance certificate attested by the Ministry of Foreign Affairs of Pakistan.