What will be my first step to obtain visa to CHINA?

For business purpose to China, Invitation Letter of Duly Authorized Unit or Confirmation Letter of Invitation from China is required. You can contact your partner in China first for this letter. Besides, covering letter from your company, your ID card, certificate of incorporation, Recent bank statement of account, hotel reservation in China and round-trip ticket between Nigeria and China are needed. So, prepare for these documents, and then, make an appointment at the Chinese embassy or consulate.