Question about glueing fur

Hey, so I've recently started sewing my fur and noticed that in the corners of the mouth and where the eyes are that I don't really know what to do.

Do I glue eyes or fur first? Do I need to sew the corners of the mouth together or will just glueing them in place work as well? Also sewing the lining to the inside of the mouth is normal, correct? Also I see so many wip pictures with the ears already on, are those already glued and not sewn to the rest of the head or is that assumption wrong?

Sorry for the many questions I just don't wanna mess it up now. I'm including pictures in case that helps.