You need to send soft copy of your 2023 tax transcript, soft copy 2023 W2, soft copy of Bills(any of electricity, water, telephone 1 month, registered to your residential address), soft copy of your pay slip(2 months should be ok), soft copy of your employment letter ,and soft copy of any government issued document you uploaded to NVC. Send the following hard copies to him: Original copy of your marriage certificate, original baby's birth certificate(as proof of relationship). He needs to do a photo collage pictures you both appeared in at different times and since your relationship started, print some of your chats, call logs and everything that proves your relationship is real and still existing. You can search the platform (VJ) for possible IV interview questions collated. You house address, employment/employer, your family background, your interests and hobbies.
I hope this helps