Newcastle University student has posted a a step by step guide on researching the names found on War Memorials. Click here for the video of the guide. It is only 6 minuets.
Why not try this yourself with your local War Memorial, or a family relative you know served during WWI or WWII?
These sites below are a good starting point and used in the video clip above.
Ancestry (You do have to pay for this site. Get permission from your parents or guardians first).