change apple id

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I am not new to apple, I have iMac, iPhone, iPad, macbook air & apple tv.

I have had ONE apple id since 2006 its my old married name and I am now getting remarried and want to change the apple id.

When I go to Create apple id the first thing it says is I can not use @icloud I thought this is what the new domain was now. What domain do I use?

Next question. What should I do next? I mean my apple id is my life, this change is not going to be easy so whats the best way to start?