I am new for web desging , i want to learn desging, but dont know where to start from... Which tool is best for desging and easy also... any suggestion , comments will be appreciated.

IF you are starting up with HTML and CSS, I would recommend you to use plain text editors with syntax highlighting. If you using Windows Notepad++ is nice. Under Linux/*nix gedit and kate are easy to use and install.

For graphics, learn Photoshop/GIMP.

Once people get comfortable with things, they tend to shift to IDE like Dreamweaver, Aptana, Eclipse etc.. for better productivity.