starting point

[nemanja.janic () gmail com]

Hi list,
i've been lurking around for some time now, trying to keep up with the posts, as i'm new to the whole field of security.
I would apriciate some pointers from you guys. I administer a small network of some 100 computers, and would like to 
start monitoring our web traffic with ethereal... 
The problem is that i do not know what to look for, and i'm not sure how to interpret what i see. Where do i start, 
what papers or books do i read, in order to better understand what Ethereal tells me when i look at the results of 
monitoring. 
I played with filters, and have grown comfortable with using them, as well as most of the options Ethereal gives me. I 
think i'm ready for the next step :)
Any pointers to interesting filter strings, examples of normal and strange traffic would really be a great help.
I hope i haven't posted this on the wrong list :)

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