Live editing

Hi Guys,

Firstly, I apologise if this already been covered.

I am a printer and want to enable customers to choose a template I will design, update their details online and have it sent to me. But I want them to be able to see what it is going to look like as they are typing it.

As I have no idea what type of plugin I am after i dont know where to go from here. any help is much appreciated!!!

Thanks in advance