Urgent Pls - Mandatory and Supporting Documents for L2 Visa Interview

[wanttoknowmore]

Hi

My Wife and Kid are in US since June 12th on L1 A - Individual. My L1-B was rejected June 15th, now I am applying for L2 based on my wife's L1 A.

Need help to know the Interview questions on my above scenario and also list of original and xerox documents I need to carry for the interview.

I read that the original I-797 and original Birth certificate of my baby kid is required is it mandatory?

Please advice ASAP