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Oh thanks I tried to create a new document just with the commands and \begin{document} like you and then I realized that I was doing \input{another document} which had pagestyle{empty} on it. Maybe that was the problem cause now it's working...

Thanks for the reply anyway

Hi, I've already read previous posts about numbering but I may be doing something wrong since I don't get any numbering in my pages. I'm using \pagestyle{headings} & \pagenumbering{arabic} but I get a plain text.
I have no idea where is the mistake! I show here the packages I'm using ...