As far as your search to find your family tree is concerned 1st July 1837 is a momentous date. That is that date on which Civil Registration of Births, Marriages and Deaths became compulsory. From that point on all Births and Deaths had to be reported to the local Registrar, Marriages were handled differently but [...]
You will find your family tree research depends on official records. This is where you will find information about any government or legally required records such as the Census, Birth Marriage and Death (BMD), Military, Criminal, Immigration & Emigration, Wills & Probate, Parish Registers and local government records amongst others.