Hi Shous and welcome! Unless you already have the basics in your cupboard your initial visit to the store will be a bit pricey... so don't faint at the checkout counter...
But once you have the essential staples like olive oil, variety of beans and grains etc... Your shopping will be a lot easier and affordable.
While you are doing your research, don't forget to clean out your cupboards, frig, and freezer. You won't want junk around.. and will need space for the yummy good stuff you buy.