You may not want to hire an attorney for financial reasons (you stated you want a "fast, CHEAP divorce"), but retaining one will be your best bet. You may want to look into contacting the Suffolk County Bar Association for assistance- http://www.scba.org/eva/index.php?p=lris
Before you sign anything you should consult with an experienced divorce lawyer. If you sign the papers and your husband obtains a divorce any money or property in his name will be his. Any debt in your name will be yours. If you waive maintenance(alimony in NY) you will never be able to go back to court and ask for it. If you have children with your husband, any custody or support obligations will be affected by the papers he may try to have your sign.
Your situation is very common....
If your spouse was served properly, you can just file the balance of your papers in the matrimoinal clerks office, and obtain a judgement of divorce based on the default of your spouse. You do not need to make a motion for default, filing for a default divorce after your spouse has been served, and failed to put in an answer, is relatively easy. This only works if you have no children and are not trying to divide up any marital property
Your husband has no right to move at and take your kids. I suggest you go to family court and file a petition for custody and file for a limited order of protection based on your husbands threats. Most family court referees will order that the kids should not be removed from the household until such time as custody and access issues are settled
From the very little that you mentions, I believe you should consider testying before the grand jury. Make sure you lawyer has filed the appropriate notices to protect your rights. My sense is this case maybe reduce to a lesser offense, but I would need more details.