Hi,
If I'm right, you can upload a .txt document that would look something like this:
Dear {title} {firstname} {secondname}, something something something at {date} in {place} etc.
And once you upload it, the script will create input boxes for Title, firstname, secondname,, Date and Place, and then you can enter in the information. i.e. Title: Mr, Firstname: David, Secondname: Weatherall, etc. and once you've entered it all, you can download a new text file that will look like this:
Dear Mr David Weatherall, something something something at 15/05/2017 in England etc.
Might need a bit of clarification on the project but I'm confident I can have the project completed in 24 hours for $150.
Let me know if you're interested,
Thanks,
David Weatherall