I found this awesome tutorial, that i will be using it soon to change my blog theme, It is a complete guide even to a noob in coding or php such an excellent drive into the creation of a blog so check WPDesigner when your free, [And the main thing is that, its divided into small parts] And down here are the links !!

• #1 Intro
  #2 Template Files and Templates
  #3 Starting Index.php
  #4 Header Template
  #4b Header Template Continues
  #5 The Loop
  #5b The Content
  #5c Postmetadata
  #5d Else, Post ID, Link Title
  #5e Posts Nav Link
  #6 Sidebar (and Categories)
  #6b Page-Link Listing (wp_list_pages)
  #6c Get Archives and Links
  #6d Search Form and Calendar
  #6e Widgetizing Sidebar
  #7 Footer
  #8 How to Validate
  #9 Style.css and CSS Intro
  #10 hex Codes and Styling Links
  #11 Widths and Floats
  #12 Post Formatting and Miscellaneous
  #13 Styling Sidebar
  #14 Footer and Dividing Index
  #15 Sub-template Files
  #16 Comments Template