Basic Magento Customization

What we need is a customization of Magento ([login to view URL]). We would like to create a wizard where each step/page has a different set of items to pick from (much like the bundled items, but with a little extra). Bundle items are very similar to what we need, however they are short just a few necessities such as adding multiple items with configurable quantities. It would also be very helpful if each segment/step had its own page. This may or may not be able to be created as a custom module in Magento, if not it will most likely have to be created by altering the core and templates - (PHP/PHTML/XML). This should not be very difficult if you are familiar with Magento and understand it.