A copy of detailed schedule, confirmed hotel reservation and round air ticket booking is not required for China work visa application. However, all Philippine passport holders who will go to China for the first time must submit an original NBI clearance valid for travel abroad besides the work permit and Invitation Letter of Duly Authorized Unit

do i need to have an apperance to the chinese embassy here in Philippines for my working visa application?or can i just have my papers processed by a reliable agency?do i really need to submit medical records even if i will let an agency processed my visa for me?

You don't need to appear in Chinese embassy in Manila for the work visa application, you can ask a reliable agency to process the application on your behalf, the medical record (Medicial Examination Record for Foreigners) is required even if an agency processed the visa for you