Mouth and eyes position assignments

Hello All,

I'm creating a video for our STEM Program for the School District I work for and am very new to Character Animator. So far I've created an Ai generated character, I've created a Pin mesh to eventually give the character slight life like movements, but now I'm focused on eye and mouth motion assignments. How do I go about assignments of the mouth and eyes for specific motions such as blinking for the eyes and movement of the mouth? Sorry if this is vague, I'm very new here.

Thank you

Nino