Assembler and tutorial

Can anyone link me to a good assembler and tutorial for Asm. I've tried Google but all I'm finding is broken links and DOS programs.
I'm using a 64 bit processor and am already familiar with programming in general.

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Then will I be inducted into your religion? Will I be able to ask more questions if I pretend to be a different person? How will you contact me so that I am the only one to receive answers to my questions as to the internals of your religion? Where can I get a cool Advisorcode? Is that term copyrighted?