As OP can see - 'A soup business' can be done in several different ways.
You have decided to look at the pouched product - Fresh soups without preservatives can be sold like this, but you have to be fairly tight on shelf life and storage.
You need a firm business plan including a budget. For this you need to do some spadework - quotes for production of pouches, artwork, ingredients and so on to get to a price point at which the product is profitable, whilst covering the fixed costs (insurance, premises etc) AND leaving you something in your pocket.
At this point you need some sample products and pitch the product to prospective buyers and discuss price points to see if the business is viable.... and not be scared to walk away or totally revamp if the outcome is negative.
Or you could take the style of business
@fisicx describes and bag a pitch at a market with a heated vat of gloop and some takeaway containers and see how it goes....
There's no easy answer or easy formula: It takes belief and commitment.... but whatever.... know your numbers and don't be scared to pull the plug if its not working.