Word 2003 Post card Template

I need a 4X6 post card, 2 up, mail merge template for Word 2003 that allows for a merge from a Microsoft Access table or query.? This template should be able to print front and back of the post card on a printer with a duplicator. Template should match Avery 8386 dimensions. We would also like to add postage on the fly. Word allows for all of this, but it is rather obtuse the say the least. I need this fast. SO let me know how fast you can commit to.