Hello Selmon,
NVC never asked me or my father to fill any kind of form and also we haven't got any welcome letter. Our attorney said it will take from 4 weeks to 8 weeks to get a call from embassy, from the date when NVC received the case. It is also not mandatory to call NVC for CEAC access, but knowing login ID from NVC does give information about Case processing. I'm thinking of waiting upto 6 weeks before asking my attorney to call NVC for login ID.
One thing i want to say is, when my case was approved , my father never got the approval letter, only my attorney gets the letter and he sent us via email.
I'll keep updating about my case, and i hope you will too.
Hope to see some good news from you.