To what extent do I need to know what i am doing with Ubuntu Linux server admin?

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http://serverfault.com – So as a bit of background, I am completely new to server admin. I am a web designer, and generally know quite a bit about computers. Until a few months ago, I had never used LINUX. Now my desktop runs Mint, and I have moved to an Ubuntu Linux cloud server with Rackspace. Essentially I have followed the following guide: http://www.symana.com/2010/12/setup-a-lamp-rackspace-cloud-server-runnin... to get to a point where I have apache, phpmyadmin etc. set up. Given that I have set up the server thus far, and I appreciate this is massively unknowledgable.. but everyone has to sta (HowTos)