Google Search Appliance and PHP

I am a newbie in PHP. I need to create a search using Google's Search Appliance for a site I'm designing but don't have the slightest idea on how to do it. Because I want to incorporate the site's design into the search results page I can't use the GSA's simple page layout wizard. Here's what I need to be able to learn how to do: 1. Create a search form and send it to our GSA (this is pretty easy). 2. Create a processing page to parse the XML 3. Create a results page using the header and footer of my site. Can anyone help me with simple explanation on how to do steps 2 and 3? Thanks, Jeff