As you some now I a kind of new in this. So I am wondering how is possible to select some records in the attribute table and make a new layer with ONLY these selected elements
Thanks in advance
After you have made a selection you can right-click on the layer and select Data > Export Data:
Then you have the option of only exporting selected records:
I will follow the steps as soon as I get the ArcMap in front of me again.
You can also create layer from selected features, but I like the solution Owen Earley posted the best. A layer from selected features only exists in that MXD and it can get really funny if you try to keep using it after editing the original feature class. If you export the data to a new feature class, you're taking a snapshot of the data so it won't change. That could be a good thing or a bad thing depending on your data and workflows.
Retrieving data ...