DO I need fallout new vegas to run the geck? I got that for xbox and honestly I didn't like at all to get for pc and moding it ... Fallout 3 I loved but is not installed atm ...

how can I use this geck with skyrim ?

You can't use the GECK with Skyrim. Skyrim's Creation Kit hasn't been released yet.

I read ppl using it to create esp files for skyrim so how are they doing then?

We've used FNVEdit or TESSnip, not the GECK.

You can use FNVEdit, at least, to make some very rudimentary plugins. Open it up without any data files, and select "Create Merged Patch" to create an empty plugin file. Then, remove the master list entirely, and change the version to 0.94. You can then do some basic things like override GMST records (only the editorID needs to be matching for these records, it seems).

I'm not sure at the moment how to do anything more complex.

Cipscis