Dave,
Any known rules about Google page rank have recently been thrown out the window!
Guesses and Assumptions:
The first time you get spidered you will be assigned a Page Rank of 0(zero), and your site will appear in the google results.
Google will "assign' you page some sort of "value" and based o that will return to re-spider your page again and adjust the results.
It is unlikely you will see further Page Rank assigned to your page for at least a month .. maybe more..
The value of your page is based on many things...
content - text/pages/images/etc
incoming links from other sites
outgoing links to other sites
internal linking of your pages
text used within your page
relevance of content and page titles and image names etc
DD