external style sheet ???

Hi all!

I'm getting ready to start another web site. Up until now, I've been playing 
with using embedded CSS and this time I want to have an external page. My 
question is, what is the working order that some of you use when doing this? 
(Please kindly straighten me out if I misuse terminology)  Should I make up 
all my pages, then do the external style page, then go back and insert the 
proper rules? Do I make a list of any possible style rules that I might use 
and then eliminate what I don't use? I must admit I don't regularly do a mock 
up on paper, and if I do, its only blocking (not color, size, font, etc). But 
maybe that's how I should start this one? I'm kind of sitting here ready to 
start but not sure how. Just looking for a jump start! 

thanks!
Sherill

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