To search birth, marriage or death records from 1837-2005 then we recommend FindMyPast. Click here to search. - they also have census records and historical electoral rolls as well as many other historical documents. You can simply enter a name and see what appears.
To search probate records and get a probate document click here
To order a Birth, Marriage, or Death certificate via the GRO click here - Tip, if you can get the index reference number (if the registration was pre-2005) then you can get your certificate much faster. To get the index reference number use the Findmypast link above.
To build a family tree then we recommend Ancestry UK and you may to able to find a tree that connects with yours - Click here