The Long Long Trail - a guide to a soldiers' life in the first world war.
I have a relative that I've been researching on and off for a few years. He fought on the Western Front in France in the first world war. He got his, Pip, Squeak and Wilfred medals. Look them up on Google, just to find out what they were.
See if you can find your relatives medal roll online. It is literally an index card with his name and number on it. There may be supporting information on it.
Sorry to be macabre, but see if you can find this birth and death certificate i.e. where was he born. This may give you more clues for further research. Death certificate i.e. when and where he died. I'd love to find the death cert for my relative. All I know is in 1920 he was still serving in the army.
See if you can find your uncle's attestation - if one was written. I've got the attestation from the relative I'm researching. It just records when he joined the army, rank, any children named etc etc
Also, see if you can find his medical records. It's just another piece of the information jigsaw. OK, it's not that fascinating that my research subject had chronic tonsillitis but, like I say, it's all info.
These internet sites might be useful:
Forces War Records (Search WW1 service records)
Find Miltary Records - My Heritage
Search Military Records/ancestry.co.uk