I'm considering purchasing an unmanaged VPS with a Ubuntu 12.04 server to host smaller sites that aren't very important yet. My plan would be to install webadmin and basically administrate the hosting end that way.
My question is: What am I getting myself into? I'm fairly comfortable with Ubuntu. I know enough to 'sudo apt-get update && sudo apt-get upgrade.'
What else would I have to worry about aside from the usual keeping my scripts (mainly WordPress) up to date?