I am about to install crown molding in my house but I have never done
that before. I think I got the cutting part down but I am not sure
about the installation part. Any one has ideas about what the best way
to install them? Is it better to nail it from the corners in or from
the center out? On the mitered corners will nails be enough or should
I
glue the corners as well (regular wood glue is good for that)?
If anyone can help I will appreciate it.

I assume you're using coped joints on the inside corners. Nail it in
the center, and leave the butt end with a little give. When you join
the butt end with a new coped piece on the inside corners, you'll be
able to marry the 2 pieces if the butt end has a little give.