Neither good or bad. In misdemeanors DAs have up to a year to file from the date of offense.

Usually it is, but if it's a real high profile case, you may get some willing to do it, or at least at a significant discount.

That is a possibility. Reason why people try to get an attorney to do it for them.

That will be a decision for the DA to make. If they believe both were involved they continue charges against both.

Court is a public, anyone can be present, especially the alleged victim.

Whether to pursue a case is up to the DA. Sometimes the DA can make a case even if the complaining witness does not cooperate. Hire a good criminal...

Infliction of corporal injury upon a spouse/cohabitant. He's only being detained. His status is still being determined.

The DA is not in a hurry to do much if they have a strong case. Your attorney should be able to tell you what is going on and what is holding back...

You need to contact an attorney in Montana to have them pull the records on that charge and sentence. Then, submit an accuracy claim to the NY DOJ.

Make sure whatever you do appear in court, if you don't already have an attorney appearing on your behalf.