I see that you most-likely still live in England, UK - so you should contact the England project as they would be the logical place to start for the Clifford family from Calne, Wiltshire, England.
is the place to start. I am sure someone from that project can help you orient yourself and get started. Another good place to look for Sources is the FamilySearch site - open a FREE account and then you can check millions of UK records for baptism, marriage and death information for ancestors. Go to: https://www.familysearch.org/hr/search and open a Free Account.
For other England sources, ask the Project! Best of luck and Happy Ancestor Hunting!!
A WikiTree Leader
and someone with lots of Wiltshire ancestors, whose branches emigrated to Colonial America!