Can i file a request for spousal support in my home state Nevada ? He lives on Long Island , in NY.

Your facts are not entirely clear.  You do not indicate where the two of you last lived together (the "last matrimonial domicile") which is important in such situations.  See the discussion in my article "The Basics of Family Law Jurisdiction," posted here.  Also refer to property and alimony law in Nevada here and here.  It would probably be easiest to do a preliminary jurisdictional analysis over the phone; please call at any time during regular business hours, and one of our lawyers will step through it with you and determine where you must proceed.