Who is to do Consular Processing or 485 in my family?

[almas]

My grandmother is a USC and filed for her daughter (married). F3, third preference, family based.PARIS, FRANCE
I130 approved in june 2005 and visa became available in November 2007. We just received the fee bills. there is 1 principal beneficiary (my mother) and 2 derivative beneficiaries (dad and younger brother). NVC sent us a fee bill for $70 and 3X$400. DO I NEED OT SUBMIT 3X70 AND 3X400 money orders?
Do i submit 1 money order or several for each applicant?

2) I would like to become their agent, can i include a DS-3032 alogn with the fee bills payment? they had an attorney of record, but i would like to take over. ALso, the DS-3032 form asks for a barcode on top of the form. Where do i find that?

3) My other brother is over 21 now, but is protected by the child status protection act. SHould i submit fee bills payments for him now, although no fee bills was sent for him. or should I send the calculation and request NVC to send me fee bills on his behalf?

Your help would be truly appreciate.

Regards,

Almas