What do I need to know to run Linux as my desktop?

Had to move to Windows for business reasons about 5 or 6 years ago. I
see no reason that I cannot return to Linux on my desktop.

I use Ubuntu for servers so I am thinking of moving to Ubuntu desktop
which is Gnome. Please no flame wars.

My question is what do I need to know to run Linux as my desktop. I
know I will need to understand and have working knowledge of CUPS,
however what else? I am hoping to be able to get my scanner working.

What else?

I am using VirtualBox so I can do a trial run.
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