You send what you have.
As it is, in any order, even incomplete. Nothing to reformat, nothing to clean up first.
Documents
PDF and Word: procedures, job descriptions, welcome booklet, training material.
Spreadsheets
Excel and Google Sheets: schedules, trackers, supplier price lists, checklists.
Photos
Paper recipes, handwritten checklists, kitchen postings.
Software exports
Whatever your current software can export to CSV or Excel, even if imperfect.
Interview
The know-how nobody wrote down: you say it, we write it.
Staff data (employees, named schedules, clock-ins) is only exchanged once the framework has been agreed with you.