1. Go to familysearch.org
2. click "search" on tool bar
3. scroll down to browse by locations & select "United States"
4. on left, scroll down to find and select "new york"
5. screen will show all the collections that are digitalized for NY. Included are land & probate. Select the collection you want to search.
Some collections are indexed (for example, the state censuses). Others are not (for example, the probate & property records). With these you will start with the digitalized indexes. Well worth the trouble.