Best Practice? Edit using Word - Acrobat X Pro to Distribute?

Question

I create Real Estate contracts/paperwork and email them to clients.  The clients then view, print, sign, and fax them back to me.
I'm trying to figure out how to setup my system so that I can modify all my document packages in Word Format then distribute them via email in PDF Reader Compatible format (so that users can save and print but not modify) WITHOUT having to recreate the PDF forms or stamps i use each time I create the PDF.
Considerations:
I use the "Sign Here" and other stamps on the documents that are only visible before printing so that they understand the paperwork better.
I need to include Word and not just go all-acrobat because the documents frequently change and I don't want to have to recreate the forms from scratch in Acrobat when they do.
I also need to keep word because I use "Mail Merge" from to populate much of the data from an excel spreadsheet for me.  The rest is user-input.
Software I have:
Acrobat X Pro.
MS Word 2010 Ultimate
I'm not familiar with Acrobat enough to know which features are available to me to best carry out my job.  If anyone can point me in the right direction, to a tutorial perhaps, so that I might learn how to minimize my workload i'd really appreciate it!
Thanks!
Edit: PS. I need the final result to be a SINGLE PDF that I can attach to email.

Answer 1

I've decided to try to simplify my question in hopes somebody can answer.
How do most Realtors Prepare their paperwork for their Clients?
Imagine this: a Real Estate Agent wants their client to fill-out a purchase contract and addendums.  They want their client's data to be auto-populated in the form before sending it.  The Realtor places stamps in the PDF so that their clients know where to initial or sign the document.
Some clients need a buyers addendum with the contract, some need a dual-agency agreement with the contract, etc.
Let's say there are three documents that could potentially be needed:
Purchase Contract (Buyers and Sellers)
Addendum (Buyers Only)
Agreement (Sellers Only)
It's the "package" that changes most of the time and not the data in the documents themselves.  I would like to be able to create a "Package" to send to the client based upon whether they're considered a "buyer" or a "seller". 
Once the package is created, I need to be able to type data in certain fields and have them auto-populate throughout all other matching fields within each document (Price, for instance).  The forms wizard doesn't match up these fields so if the price field is in there 5 times, i have to type it in 5 different times.  To only do it once I have to manually change the tooltip/name to have them all change at the same time.
Optimally, in each package I want to be able to import the client's information from Excel so that most of the person's information is auto-populated.  For example, their name & Address.
My reality is that there aren't only 3 documents, there are 15-25 per client that I mix and match depending in their needs. THE CATCH is that sometimes I have to include protected forms to the package.
If anyone can suggest the most efficient way to do this (or at least any way they do it), I'd really appreciate it.
-Neil