The only thing I would say, is that if you start doing your tree, double check the information on other peoples’ trees before you start adding them to yours… this will make sense once you start.
I made this mistake and had two of the same person on the tree, but as details were slightly different it just added them on.
Just spent two days in France for commemorations for the Battle of Boars head, a day before the Somme, where my Great Grandfather fought and was wounded, along with another relative who was only 17, but sadly died.
We then headed down to Flatiron Copse, where I surprised my Dad by showing him the grave of his Great Uncle (he never knew he existed? killed during the Battle of the Somme. He got very emotional.
If you can get some basic details such as name/regiment and service number, this is an excellent website, and you get real military geeks who will really help you out if you post something. http://1914-1918.invisionzone.com/forums/index.php
They will find war diaries etc. which may mention your relative.