Form I-485 Application to Register Permanent Residence or Adjust Status - http://www.uscis.gov/files/form/i-485.pdf
In the form I-485 i am asked for social security number, i do not have this as yet, is it ok?
According to instructions to the form 485 - http://www.uscis.gov/files/form/i-485instr.pdf - Answer all questions fully and accurately. State that anitem is not applicable with "N/A." If the answer is none,write "none."
Part 2 asks for application type. I entered the US on a k3 visa, what option should i use?
You likely have the approval notice that gives you an immediately available visa number - if so you need to use (a)
Part 3 asks for non-immigrant visa number, where do i find this on the visa?
Visa Number should be on the approval notice for an immigrant petition (I-130).
In part 3, processing information they ask if i have ever filed for permanent residence. What is the status? My husband had filed the I-130 which is already approved but pending. Is this related to the question in the form?
That related to situation if you filed a petition before - it is not related to your current application. Your answer will likely be "No"
Filing I-765 number 16. It asks to put in eligibility categories. I do not know what to put here.
K-3 Nonimmigrant Spouse of U.S. Citizen orK-4 Dependent--(a)(9). File your EAD applicationalong with evidence of your admission such as copiesof your Form I-94, passport, and K visa. - page 4 instructions.
The filing fee for a Form I-485 is $930.00. An additional biometric fee of $80.00 is required when filingthis Form I-485. After you submit Form I-485, USCIS will notify you about when and where to go for biometric services.
The filing fee for Form I-765 is $340.00.
As you live in Massachusetts - send your application to theTexas Service Center:
USCISTexas Service CenterP.O. Box 852211Mesquite, TXNNN-NN-NNNN/p>