New South Wales Will Books 1800-1952 are now online on findmypast
New South Wales Will Books contain copies of original wills. The information varies but they usually include name, address, occupation, beneficiaries, details of their estate, date of death. Each record includes a transcript and an image of the original document.
State Records NSW has Will books up to 1984 and also Probate packets from 1817-1976 and 1989 (part). See their excellent Archives In Brief 84 - Probate packets for more information.
Speak to staff at the Family History Desk in the State Reference Library (Macquarie Street Wing) if you wish to access findmypast.