My first step would be a barrage of Google searches on anything to do with JG77, White 10, and 109K-4s. You might strike gold and find a site that has all the info you need, or perhaps find a clue that will lead to some useful info. With the lack of late war Luftwaffe photos like Von said, it's likely you may not find anything.
You can look through websites like these for a profile of the plane your looking for.
http://wp.scn.ru/http://www.michael-reimer.com/CFS2/CFS2_Aircraft_Profiles.htmlYou need to be careful when using a profile as a reference. So so many of the profiles out there are just plain wrong. They can be useful, but you'll want some pictures to to back it up.
It's a good idea to search through forums that specialize in Luftwaffe planes. Some very knowledgeable people and authors can be found posting on these forums.
http://www.luftwaffe-experten.org/forums/index.php http://forum.12oclockhigh.net/index.phpIf you haven't found anything helpful on the internet you may want to consider a different JG77 K-4.
If you still want the same plane, it's time to hit the books. Your best bet would be to find a book on JG77. The Osprey books are great, but if your looking for a specific plane from a specific unit your probably won't find it, unless it's a JG77 Osprey book of course.

I thumbed through my only K-4 book and found a picture of JG77 109K-4 "White 1", "White 2", and a profile for "White 1".
If you find enough info for your plane, these will help with panel lines and other small details you may not know about. They have a bunch of pictures of surviving planes taken at museums and airshows.
http://www.primeportal.net/the_airstrip.htmhttp://aircraftresourcecenter.com/ -Click walkarounds at the top.
http://www.cybermodeler.com/resource1.shtmlThe thrill of the hunt for info is one of my favorite parts of making a skin. Have fun.
