Heinrich Thurman, KIA in 1916

[WarrenD]

Hello Forumites,
Been a long time since I've been by. In any event, a friend of mine informed me this evening that his great-grandfather was KIA in WWI while serving in the Luftstreitkrafte (sorry for the misspelling). I've never had anyone in WWI to research having had no direct ancestors that served.

In any event, where do y'all suggest I start in trying to research this gentleman? My book budget is almost non-exixtent at this point since: a) it's Christmas time, and b) I'm still recovering from a job loss in 2011, and have only recently returned to full time work. So, buying gobs of books, while something I'd normally enjoy greatly is really not a possibility right now.

Any online resources you can suggest for me?

Thanks so much for your help and advice.

Warren