H1B, H4 Visa

Hi All,

I attended the interview on Feb 26'th along with my wife. VO asked me about the company and the project details. I told them i am going to work for some xxx client. After that she did something in the computer and asked me how my skill set matches with that client requirement. Then i replied how my current skill set is and how it matches with the client's requirement. Then she asked me how did i get this Job. Then I replied her that i have seen the propjects this company is doing in their website and i applied on-line. Then later they conducted me set of interviews and finally selected me. Immediately after that she asked me to show the un-employment wages report. Unfortunately its the only document i missed. And i told her i don't have. Then she issued famous 221G blue form by marking all the documents except the first two from the company side.
Please answer me the following questions
1)Coming to my wife, what are all the documents i have to submit. I know the following docs.
a) Marriage certificate b)Marriage photo's
Do i need to submit the original Marriage certifictae or xerox is enough? If i submit original will they send me back?
Please let me know what are all my wife's docs do i need to submit
Since visa officer has not asked anything abt my wife, is there any need of submitting docs of my wife
Kindly clarify my doubt

Thanks
Vijay