Hello false1

welcome to the Blender forum and from what I see so far your well on your way to using Blender. As to making eyes I would recommend watching this series of tutorials https://www.youtube.com/watch?v=0QT1GNMevfc on how to to do topology work flow when modeling a face for a character I feel it will explain how to get your round circular mesh and still keeping all one object. I am also sure some of our other members will chime in soon and offer even more advice but in the mean time hope this helps some.

Good Luck

Lobo3433

Blender Maya & 3D Forum Moderator

Renderosity Blender 3D Facebook Page

Forum: Blender

Subject: Fitting a round object to a square face