WIP:: Alien dude

This is my first model in Blender. I started doing 3d in Cinema 4d, and now I am trying to figure out this app to add to my arsenal. I thought a simple character would get me going quicker in the program. I really like the interface now, starting to feel more comfortable, but I have a few questions.

Q: How do I get rid of the Huge seam between the mirror meshes? Do I have to join the center points?

Q: In Edit mode, when I’m moving points around is there a way to type in a set value for multiple points?

Anyway this is where I am so far. C&C welcome.