I have a .net app that is running on IIS on my computer.  Everything works well.  How do I deploy this on a page on my DNN site?  I have come to understand that I need a custom module, but would really love some help getting started here.  Thanks!

If you need the page to run under a site quickly the Iframe module is the way to go.  Then you can take you time learning how to build a custom module for DNN and then write a module to replace the functionality in the Iframe.  This is how a usually convert old sites over to run under DNN, that way static content can be entered into migrated over immediately, while dynamic pages can be migrated over at a slower pace while still retaining the functionality on the old site.  The only downside is that the old site / code has to be kept up and running until all the functionality is migrated to the DNN site.