Give A Collection Pre WWII German Stamps

I was recently given a fair amount of German stamps by a friend; these were brought over by his uncle just prior to WWII. He would only accept any money if I could sell some of the stamps. Having seen the prices of these stamps some expert advice seemed called for.
I've done a little research and here's what I've come up with;
Deutsche Nothilfe - "Rosenwunder" - 50+150 Pfennig looks like a good candidate, the sheet is just one of several and I would like to keep some of these. The last picture is just of few I culled out of the more common items although I question if the line thru the 5 tausend mark stamps may not be viewed as a questionable cancel. I'm not sure if this was a common practice. Is e-bay the best place to sell? Any help would be appreciated.
John
My apologies for the photos rather than scans.

Hello I am interesting to buy all what you have, send me all scan of all stamps on dlacicm@yahoo.com