I am trying to think of a way to develop the following type of application...

I want visitors to be able to create flyers, postcards, etc. with dynamic
content that they either upload themselves or pull off of the server. I want
them to have both of those options. The flyers, postcards, etc. layouts will be
created in advance and the visitor will upload to designated areas on the
layout. I invision the layout appearing on the screen with buttons at the
locations where they are able to change data. When they push the button a popup
appears with a field for uploading and below that a list of content that is
stored on the server that they are able to choose from. Once they fill in all
the info. they will click create and be taken to a page that offers the option
of creating a PDF or an email. Ideally I would like them to be able to send the
email version right from there.

I have been tossing around the language I would want to do such a thing in. I
am much more adept at flash than PHP, javascript etc.. I was hoping that there
might be a way I could use flash to create something like this...? I've also
considered using dreamweaver with coldfusion.

How involved is a project like this? What would be the best
software/language/mark up to use? Could Flash be used as a tool in creating
something like this? Would dreamweaver be better? Any other thoughts would be
great too.

Looking forward to your responses!

Thanks!

Blanthy