Customer signup and personal page

This is probably already a tutorial, but I cannot find it in my searching.

I need a system\tutorial for setting up a site that allows:
a) visitor comes to static front page
b) likes the product we offer (which they customize after purchase)
c) purchases product ie: paypal
d) gets a page\node that is personalized and has their product on it available for download

That seems very straight forward, but I cannot find a total system or howto for doing this.

thanks,