You have handwritten a document and you want to send it for publication. You want someone to DIGITISE it so that the printer can read it easily and edit it.
"Typesetting" is something printers did, before computers: they "set" the text in movable type (they put thousands of individual metal letters into racks, to use in printing pages).
"Digitize" isn't right either. That is used for data (numbers).
You are "creating a text file". You are "putting your text into a text file". Then you can email the text file to the printer.
Note: your "text" is the set of words and punctuation, which you have now in handwritten form.
Note: There are many different kinds of (computer) file. There are several kinds of "text files" (computer files designed to hold writing). Nowadays printers use digital methods for printing. They can easily copy text from any text file (in any text file format) into a file in the format their printing program uses.