Yes. Since you have more than one member in your LLC, it will need to file a Form 1065, even if its a "zero return" with no income to report. Note that if there were only one member, it would be treated as a "disregarded entity," and not need to file a 1065 (instead reporting on the owner's schedule C of their 1040), however, this is not the case, so yes, you must file a Form 1065 for the LLC.
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Yes. If you have not done so already, you can obtain a tax Id number for the LLC using form SS-4 from the IRS Forms and Publications website.
You haven't identified the other parties involved in this question so I cannot determine whether I may have a conflict in this matter. Should it turn out that I have an attorney-client relationship with any of the other parties, my response to this question will not prevent me from continuing to represent an existing client.
Yes, you are required to file a 1065. This will avoid a penalty and will start the statute of limitations on audit and collection.
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