I want to attend the canton fare in China happening in April 2019. I am applying for the first time.

If you can get an invitation letter, you can try to apply for F type. You should first prepare a filled-out application form, passport-style photo, your passport and its photocopy, letter of undertaking from your company, your introduction letter, round trip air tickets and hotel reservation and an invitation letter from China, bank statement as well as other requirements. Next, go to the embassy of China to submit the application. The application fee is free of charge.