How do i apply for the work visa? Do i need to go to embassy in Beijing or can i do it online?

You should first prepare those materials including your passport, the degree certificate, the application form, a passport-style photo, the relevant documents from your company, and other materials required by the consular officers. You need to apply for it at the embassy of UAE in Beijing. You cannot apply for it online.
You’d better contact with the embassy and ask for more information. Tel: 010-65327650, 65327651 or 65327653