Need help to built a website

Hi to all professional web designers here!
I want to built a website, I am a noob with that. I want to know does all HTML/CSS websites designed by professional web designer start with designing a PSD first or you directly start coding and linking custom graphics to it?
Is PSD the 1st step to develop a professional website in HTML/CSS? or anything else?
And what about the PHP websites does it follow the same procedure of development as of HTML CSS websites or we need to start with something…
Need help to built a website

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