I need help with the preamble. Here is the code
\documentclass[12pt,letterpaper]{book}
\ProvidesLanguage{Italian}
\usepackage[italian]{babel}
\usepackage[ansinew]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{fancyhdr}
\usepackage[pdftex]{graphicx}
\usepackage{booktabs}
\usepackage{fancyhdr}
\usepackage{geometry}
\usepackage{amsmath}
\usepackage{amscd}
\usepackage{amsxtra}
\usepackage{amsthm}
\usepackage{enumerate}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{float}
\usepackage{titlesec}
\usepackage{xcolor}
\usepackage{parskip}
\usepackage{lipsum}
% THEOREMS -------------------------------------------------------
\theoremstyle{definition}
\newtheorem{thm}{Teorema}[section]
\newtheorem{cor}[thm]{Corollario}
\newtheorem{lem}[thm]{Lemma}
\newtheorem{prop}[thm]{Proposizione}
\theoremstyle{definition}
\newtheorem{defn}[thm]{Definizione}
\newtheorem{conj}[thm]{Congettura}
\newtheorem{ex}{Esempio}[section]
\theoremstyle{remark}
\newtheorem{oss}[thm]{Osservazione}
% ----------------------------------------------------------------
\pagestyle{fancy}
\fancyhead{}
\fancyhead[R]{\itshape\nouppercase\rightmark}
\fancyhead[L]{\itshape\bfseries\nouppercase\thepage}
\fancyfoot{}
\renewcommand{\headrulewidth}{0.5pt}
\renewcommand{\footrulewidth}{0pt}
\fancypagestyle{plain}{
\fancyhead{}
\fancyfoot{}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}
}
%--CHANGE CHAPTER TITLE------------------------------
\titleformat{\chapter}[display]
{\normalfont\bfseries}{}{0pt}{\Huge}
\titlespacing*{\chapter}
{0pt}{20pt}{40pt}
%----------------------------------------------------
\begin{document}
\sffamily
\frontmatter
\begin{titlepage}
\centering
\huge{Title}
\end{titlepage}
\cleardoublepage
\tableofcontents
\chapter*{Introduction}
\lipsum[1-10]
\mainmatter
\part{Part1Name}
\chapter{Chapter1Name}
\lipsum[1-2]
\section{Section11Name}
\lipsum
\section{Section11Name}
\lipsum[1-2]
\chapter{Chapter2Name}
\lipsum[1-2]
\section{Section21Name}
\lipsum
\end{document}
How can I have blank pages when they are empty? As you can see pages ii,iv,viii,6 are not blank. I'd like them to be blank but without altering the numeration.
Furthermore pages vi and vii have the wrong name on top (it should be "Introduction").
Is there also a way to have the number of the page on the top-left in the left pages and on the top-right in the right pages of the book?