How to use sudo to get a root shell?

I am wondering if someone can tell me the right way to get a root shell
through sudo. I tried the following commands:
sudo su -
sudo -i

Then tried the following command and got this warning:

lsof|grep openvpn
lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file
system /home/joe/.gvfs Output information may be incomplete.

It looks like Linux is looking in the wrong directory for info. I have
read that the correct way to do this was sudo su - 
This would use root's environment and home directory.

Looking on the Net is confusing as I get conflicting advice between
this.

Thanks

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