More details on your operating system would help and location of where the installation was made.
There is no order for packages, XAMPP should install it in the correct order. XAMPP is a pretty straightforward installation, you can only access PHP files served from a web browser accessing a web server since it relies on the PHP interpreter to interpret your page. The most common way would be
http://localhost/ to test if the server is actually running and displaying the XAMPP configuration page.
You would need to store your PHP files inside the directory it creates for storing your web pages, www or public_html or something like this, I haven't used XAMPP in a while so I can't think of where you are meant to have your files. Once you've discovered the location, to access the pages you would do
http://localhost/your_php_page.phpYou may also need to check your XAMPP control panel to make sure all the required services you need are actually running.
Cheers,
MC
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