How to do a wedding ceremony with papers done already?

I already got a marriage commissioner to do a simple private ceremony and the paper work before.
Now, Me and my wife is planning to do a real wedding ceremony to invite our friends and families. I wonder how I should do it? Is it possible to skip the papers? I dont want the guest to know about it.

Can I wear this dress for my wedding?

http://www.dhgate.com/p_ff808081269d6eec0126ac76c86d1b0e.html

Is this dress suitable for my wedding? Do you think it is a cheap dress for wedding?

Where can I buy gowns and dresses for a wedding in New York?

Where can I find dresses for a wedding as a guest? I want it to be long and the back not to be too open. I want it to be not to be to bright with the colors. Black, dark blue, or gold would be nice. I need the store in New York anywhere areound New York! Please give a link gfor the dresses and a website for the resource. Thank You!!!!!