1) Do I need to submit a formal letter for each application (485, AP, EAD)? If so, can anyone provide me with sample letters? I am the primary applicant for my wife and my case is pending in NSC.
No, you don't need any letter. Just fill-out the forms in complete manner.
2) Do I need to submit a copy of I-140 approval notice. I have conflicting information on this issue. Do I need to provide a copy of I-797.
No, you don't need to attach your I-140 for your wife's case. But, as you are applying your wife's case separately, attach your I-485 receipt.
3) Has anyone applied by himself for his spouse’s 485, EAD and AP without hiring a lawyer. Is it OK.
Many people did and got approved. Dependent applications are generally simple. If you know what you are doing, go ahead.
No, you don't need any letter. Just fill-out the forms in complete manner.
2) Do I need to submit a copy of I-140 approval notice. I have conflicting information on this issue. Do I need to provide a copy of I-797.
No, you don't need to attach your I-140 for your wife's case. But, as you are applying your wife's case separately, attach your I-485 receipt.
3) Has anyone applied by himself for his spouse’s 485, EAD and AP without hiring a lawyer. Is it OK.
Many people did and got approved. Dependent applications are generally simple. If you know what you are doing, go ahead.