Alex, first of all best of luck at the interview!
Definitely bring the copy of your resume with you. Since you said it's for receptionist (I assume you'll work with the clients a lot) I'd dress professionally (darker longish skirt or pants, and lighter color blouse/shirt, not too many rings/necklaces/bracelets/etc, modest make-up (if you do make-ups :) ).
As for interview itself, be honest, smile, do NOT discuss or talk about any conflicts in your previous work/home/school. Don't forget to read what you can find about the company on Internet, so when they ask WHY you are interested working there (and in most places they do ask that) you could explain. Also it's nice to ask questions about the company, perspectives, etc. in the end of the interview - it shows you are indeed interested.
Again - best of luck!
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"When we are no longer able to change a situation - we are challenged to change ourselves."
"How people treat you is their karma; how you react is yours."