Hi, if you are trying to trace the family history, then start with you mothers birth certificate. It will give your grandmothers maiden name, your grandfathers name and occupation and their address at the time of the birth.
If you know or can find out when your grandparents were married try to get a copy of the marriage. Apart from their names, it will also show your grandparents ages, (full means over 21) their occupations, names and occupations of the respective fathers and names of witnesses. From the ages on the marriage certificate its easy to work out their birth year, then you can look for their birth certificates.
I have found out that death certificates give some information too, but that's no help if you don't know when someone died!
These web sites might help.
www.familysearch.org (Morman site)
www.freebmd.rootsweb.com (Births Marriages and Deaths)(not a complete listing but they are getting there!)
You don't need to register on either and the information is free.
www.1837.com is a pay-per-view site, and needs registration, but lists all Births, Marriages and Deaths registered since 1837.
www.ancestory.com has loads of info and you can have guest membership (free)
www.cyndislist.com - thousands of links to search sites.
If there's a Geneology society or group locally to you they could probably give you pointers too.
Tracing living relatives is harder as there are fewer resources. If you know any of their names, you can try advertising in local papers, checking the electoral register, phone books etc
but not if they are ex-directory.
Hope this points you in the right direction, and good luck with your searching.