You can start by using FreeBMD.org.uk, and tracing his death, marriage and birth records.
But to go back further, you will need to know his parents - and that normally means buying certificates!
Once you are back to 1911, you can use census information - but that will require a subscription to a genealogy site (Ancestry, FindMyPast, GenesReunited, for example).
Possibly your local library will have free access to one of those sites.