We've all been there before!
Zend Framework is a pretty powerful MVC framework for PHP. There are scads of tutorials all over the net. The quickstart tutorial is good to get a general skeleton of an application, but I found Akrabat's Zend Framework tutorial to be a better real world example.
ZF is fantastic when you're at the point where you need to develop robust applications and need a whole suite of libraries to accompany this - ZF's library is huge and all the components play quite nicely with each other (although, you can rip them out individually and add them to any project). The downside to ZF is that because it is so flexible, there can be quite a bit of complexity in setting it up.
To be honest, if starting to get your feet wet with MVC applications, you might try something a little bit more straight forward. I find CodeIgniter to have a very short learning curve while maintaining the fundamentals of MVC design. CakePHP also walks you through the steps quite deliberately.