Transfer scripts to mobi format for kindle / e-reader reader

Description

I want to transfer documents from word and pdf into a mobi document to be read on kindles / e-readers. This is a little more difficult than it sounds for 2 reasons:
1. The kindles are unregistered and many of them are old (first generation). There are about 30 of them. So these need to be mobi files that we can load up using a usb connection. We cannot a) make them all work with e-pub. Also b) we cannot upload as though they are registered.
2. the documents are not a novel or essay but a drama script so the formatting needs to be preserved in an easy to read accessible format
Name: "Speech"
Name 2: "Speech"
stage directions / sound effects possibly in italics.
I am attaching a small example of the sort of thing. This means that there may be some formatting of each document to do before loading up as a mobi doc. We are looking for a reflowable set of documents.
All told we will need about 70 scripts done. Half are very short (1 to 7 minutes in length) some are much longer. The longest will be one hour in listening time. But we will be paying for the total job. I shall put in a fixed price but feel free to quote your own cost.
We are looking for this to be done by the end of this week.
Most important to repeat is that we end up with files I can just upload through a usb cable onto the kindle. I do not want youtube video guides how to transfer in other ways.
About a third of these scripts already exist as mobi files. Where this happens you are welcome just to check that they are properly working as a reflowable file and count them done. But if they are not working it may be easiest to start from scratch and convert the word / pdf into the reflowable file.
The scripts are read in order and on different days – Monday to Friday. So we are looking for them to be in 5 different folders and to appear chronologically day by day on the kindle.
Perhaps we should pilot one or two files and make sure we can get them to upload before then transferring the remaining documents.
Before accepting a proposal I will send a link to all the files on a google drive so that the freelancer can check and feel comfortable that s/he can deliver
Thanks