Adobe After Effects to Editable Action Script File

Hi, I need a script/gui that will allow me to edit the TEXT and and replace an LOGO on an AE animation file. I just want to be able to use this script to change the text and change a logo on an AE animation. I'll be using adobe AIR as I need to integrate this script to my application, you just simply need to create a way to allow me to EDIT the AE file to customize the text and an image on my adobe air app. I hope is clear,