No the divorce should not impact the merits of your VAWA case.

It is taking 1-1.5 years for interview scheduling.

As you would be adjusting through marriage to USC, the length of overstay would not impact your case.

It is worthwhile to have an attorney until the final processing is complete, although you appear near that.

It is form AR11 and may be done online.

No the withdrawal of sponsorship is not disclosed but the impact of the case will be eventually determined.

No you will not qualify under the 3 year rule as you are now divorced.

Yes based on the information provided, you may indicate you are the preparer.

No this is not required for interview but can be done.

Depends on whether you were admitted as an LPR and were in the legal and physical custody of your mother before age 18. Consult with an attorney...