Start with your county health department. ServSafe is a very informative food handling program. You might be able to download their booklets for free. There are other similar programs that i can't recall off the top of my head. Good to narrow down the list. You were going to have $100s tied up in inventory.That is a good idea on how to handle the gluten and dairy free products. Do you know where to look in the town/state health requirements to find what I need? What do you think I would also want to put in an order form? I haven't done anything like this and am not super sure of my abilities to handle payment.
Down the road, if you ever do need a commercial kitchen, most churches have licensed kitchens.