The wife can file for divorce and proceed with or without the husband's appearance. The wife must ensure that the husband is properly served and that the process server completes an affidavit of service.
Any child born during the marriage is presumed to be a child of the husband. You can (and certainly should) demand a paternity test at the first court appearance.
Be very careful in litigating such a support and paternity case. One small misstep may result in you being liable for child support for the next 21 years.
Generally, you're entitled to half of any property acquired during the marriage. If it wasn't acquired during the marriage, you will probably not be entitled to any portion of it. You should speak to a matrimonial lawyer ASAP.