H4 stamping with new company I797

I recently received my I797 from my new company, I have not received my first pay stub.

currently my wife and daughter are in India and I am in USA, I planning for scheduling for H4 Visa stamping for them,

Do I required my New company Pay stub or Invitation letter ?
What all document they need to carry for Visa Interview ?
Do they need the my original I797 with them ?
is there a dependent I797, when I asked my new company they said if your family is in India they can’t do any thing from here, so I have to do all necessary action.

Regards,
Thangadurai

Use this list of H4 visa stamping documents:

Your employer is right that there is no separate H4 i797 if they are not present in USA.