i-485 after NIW approval

[malagat]

Hi, all.

My EB2 NIW petition was approved and I am preparing i-485 for myself and my family.

I am still on F1 visa so technically I do not have a job except 20 hours of GAship. The question is if I should file affidavit of support for my family members as I do not have a letter from an employer. Are my tax returns needed. Will my bank statement be enough?

Any tips and ideas are appreciated.

Thanks