Ordering electrical supply
Just stating the amperage required is not enough information for the electrician to supply what you need.

If you are asking the electrician just to run a 100 amp metered main panel with no additional circuits or outlets for appliances, the amperage, voltage (e.g. 120V vs. 240V vs. 480V, etc.), and phase (1-phase vs. 3-phase) of the electricity should be enough information for the electrician to run the wiring for the panel.

If you are asking the electrician to run individual circuits to your appliances, then the electrician will need more detailed information about each appliance which can typically be found on the face-plate or a label on the equipment.

If you give the electrician some more information about each major appliance (or at least the type of appliances you will need if you have not picked them out yet) and the type of work spaces in your kiosk (e.g. kitchen), that should be enough to help get the conversation going further. If that doesn't get the conversation going any further, then you may want to look for another electrician who is willing to work with you on the specific details of your needs.