Which project preset did you select when you started your Premiere Elements project? Version 9 includes a number of presets for DSLRs. If this camera's video is represented by one, you will find it in the DSLR preset menu.
You are correct that, if you have selected the ideal project preset, you will not see a red line above your clips on the timeline and you will not need to continually render your project.
I've written books over version 9 and I have produce a series of 8 free Basic Training tutorials for Premiere Elements support site Muvipix.com. In part 1, I show you how to set up a project and select a project preset.
Ive installed the DSLR presets and choose the DSLR 1080P 29.97fps when I start a new projekt
When I put the files at the timeline I don´t have to render but as soon as I do something (just about anything) to the clip I have to render It to be able to play it, the red line appears above the clip.
That´s why I thougt a "easier" format would solve my problems.
It sounds as though you're already using the ideal format with the ideal project settings, Videoten. There's no way to avoid having to render your timeline once you start adding effects or transitions to your clips.
So It doesnt make any difference if I convert the movie to AVI or Mpeg2 or record in a different size?
There will be as much rendering in other format as it is now?
The only difference would be if you converted your video to a standard def movie and edited it in a standard DV project.
You'll still have to render every time you add effects or transitions -- but your renders will move about 3-4 times faster.