Proper way to stain/seal a new deck

What is the proper way to stain/seal a new pressure treated deck?
1st pressure wash the deck, then apply the stain?......
what are the tips and tricks to do this job right? Do I need to stain the entire deck, including the supports and underside of the boards?
The deck is approx. 19'x10' and is located in surburban Washington, DC. it was installed 4 weeks ago.
Thanks! Brian snipped-for-privacy@yahoo.com
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You dont need to wash a new deck, be sure its dried out from the pressure treating. Stain what you see the stain is cosmetic
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