Help creating automation for adding headers that reference file and folder name

Hi I am trying to figure out a way to help automate a header process. Below is my header that I want to create. As you can see, the center and part of the right column I want to make dynamic to reference the folder name and the first part of the file name. New to this- from what i have researched this seems possible using a set of guided actions that incorporates javascripts.

Overall I want to click 1 action and have acrobat do the following:

1. Flatten PDF

2. Shrink PDF contents so that adding header does not interfere with contents, maintains uniform margins across all files.

3. Add custom header as shown below

4. Save PDF

Would be even better if I can select multiple PDFs to all run at the same time.

All my file names have a "_" after the fixture type which should help when creating a script to retrieve the partial file names.