You should contact an immigration attorney immediately and especially prior to entering into any plea agreement. Deportation proceedings are not imminent unless you plea or are convicted of a crime that triggers immigration consequences. Many times, your initial charge can be reduced to a charge that does not trigger deportation proceedings. Your criminal attorney should be working in concert with an immigration attorney to assure that whatever the end result of the criminal case is, your chances of deportation are lessened.
A domestic violence conviction can have serious immigration consequences. While you might not be deported, you will likely be prevented from returning to the US if you leave. What I have done with cases like this is get a Plea in Abeyance to lead to a dismissal. In tougher cases/DAs, get the charge changed to a 242 battery, stipulate to facts that remove the domestic violence components because ICE can look at the facts of the case beyond the type of conviction. Otherwise go to trial.
I agree with the answer's of my colleagues. A domestic violence conviction can have serious immigration implications. You should contact an experienced immigration attorney as well as an experienced criminal law attorney immediately.
It should also be noted that, independent of the criminal case, the alleged victim may file for a restraining order in the Family Law Court under the Domestic Violence Prevention Act (DVPA), which may also have serious immigration implications. If that occurs, you should contact an experienced family law attorney immediately.