Assuming you want to start vncserver as someone other than root, you might try something like this in your /etc/rc.d/rc.local file (your path to rc.local might be different):
su - someuser vncserver &
I can't say if this will work for vncserver but it does for a couple other programs I run as a non-root user at startup.
I'm not sure I'm understanding your 2nd question, though - do you NOT want to have a window manager start up when you run vncserver? You ONLY want console? If so, you may want to run something like sshd instead. If what you're asking is how to have a console up and running on your desktop when a user logs into vncserver, you can add a line like this to your ~/.vnc/xstartup file:
xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
Hope this helps