Apart from certain statistical information, details of a census are not released for 100 years, consequently the latest census available is that of 1891. Usually the Census is only published in the order it was taken as the Census taker moved from house to house. It is an advantage, therefore, to have some idea as to where your ancestors were residing at the time. The LDS , has been instrumental in computerising the 1881 Census so that it is now available, within counties, in various forms, including alphabetical. All censuses for Cornwall are held at the CLSL and most are held by the CFHS , the CRO and the LDS .
Wills are yet another source of information.
The CFHS , most centres and even some libraries, hold indexes which give name, date and parish of some 80,000 wills from the late 1500s to the mid 1800s held at the CRO . Wills since 1858 are kept at the Probate Registry , Market Street, Bodmin. It is a great thrill to visit the CRO and actual handle the will an ancestor made, perhaps 300 or more years ago. Hopefully this basic advice will get you started but there are many other records such as leases, tithes, poor law records, the military, etc. which could well be of use at a later stage. Most of these records will be held at the CRO, CLSL and the Courtney Library .