Okay, I laughed out loud at this!! Not at YOU, but because this is exactly what happened to me the first time I went. You have to use a quarter to unlock the grocery carts and then you get your quarter back when you return the cart! And yes, you'll need to bring your own bags or boxes. They check your groceries in the checkout line REALLY fast so that the line of people waiting to check out doesn't get too long. A lot of times you can grab used/empty boxes from around the store and use those. (Like at CostCo) So again, just some things you'll need to get used to.
Hooray for trying new things!!! Make sure you also grab an Ad for next weeks sales at Aldi. That will help you decide if you'll be going back to Aldi or Kroger.