I130 application approved what are the next steps for Permanent resident apply for spouse

Summet

Registered Users (C)
I got mail from National Visa Center couple of weeks saying:
"the immigrant visa petition filed on behalf of my wife has become eligible for further processing at the National Visa Center"
And further I am told to pay $88 for processing fee of Affidavit of Support.

What is this letter about? I had filed an I-130 for my wife as a greencard holder, which was approved but was still not eligible for CP, as per my understanding. I applied for her on June 28th of 2011 and as of november 2012 visa bulletin the priority date is June 2010.
I would be glad if anyone can advise me on the future processing. As of sponsorship, I was on F1 before getting a green card, it been 2 yrs since I got my GC and since then I didnt work till this year. I recently started working like 6 months ago and I am sure it wont be enough to sponsor my wife. So can I have my friends be the sponser.

Thanks in advance....
 
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