These are the things you need to be a sysadmin, first read all of the BOFH http://www.theregister.co.uk/Tag/bofh
and learn this chart.
In reality I picked up a systems , network admin job with minimal experience, and desire for that field. I was working as a developer, gofer at a company. The previous sysadmin was let go due to his lack of doing anything. I ended up being shoe horned into the sysadmin job and have been at that for a year and a half. I would love the job if it didn't also include help desk support.
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Wandering through an alien environment wanting to understand. And also wanting to find happiness in my life. Wondering if that will ever happen.