1. The Games Indy 3-4 and Monkey 1-2 was really created with this scummtool, which you can download?
No.
2. Let build all (really all!!) scene from the original games (see 1.)?
No.
3. Where is a mostly qickly and understandless manual for this programm, mostly in german?
SCUMM and the manual has not been released. And probably never will.
4. There are demo, which created by the editor (language is not important)
No.
I think you mean GLUMOL or SCRAMM which is both as dead as it can be. There are quite many good adventure creators out there.
Read this:
http://www.n-chicken.net/features/decentpointnclick.shtml)
or find an engine here:
http://www.ambrosine.com/resource.html)
But I think you meant viewing resources, right?
Try LucasHacks.