How to start from Scratch ?

[eluser]PhilTem[/eluser]
If you access http://localhost/codeigniter (assuming you put codeigniter in a folder called "codeigniter" in your webroot folder (usually that one is called htdocs for xampp)) then you will see a "success" page that shows that CI is running on your server - or was at least running for creating the response to your one request.

The next thing you do is reading through the user guide. After that you should read through it again. No seriously, read through it again!
Afterwards you either follow the tutorial mentioned in the user-guide or you think of a simple web-app that you might want to create. Therefore you launch your favorite file-editor/IDE to create and edit php-files. If you read and followed the user guide you should know what information you will put where