Where do I start?
To come in from the outside with no knowledge of the business, is like imagining that you could start a taxi company, by tying two bicycles together!
I am guessing here, but you are a keen cook - am I right?
There are several good reasons why hobbies seldom make good start-up businesses -
The biggest problem for all start-up businesses is all the other start-up businesses. At the budget end of the market, there is a great crush of other, similar enterprises, all competing for the same small market.
The hobbyist seldom has enough knowledge of the practicalities of the business and the market in general. Someone coming from inside the business will know a great deal more about how to make a fist of things as a business, than a keen amateur. For example, a professional cook knows where to buy his food, which equipment gives the best results and how to organise a restaurant in a way that no housewife preparing the Sunday roast ever could. He will have all kinds of inside information about where to buy equipment and as a jobbing cook, will already have learnt from his or her mistakes and from the mistakes of others, lessons that the hobbyist still has to learn.
There is also the simple fact that the hobbyist is very often seriously underfunded and therefore does not have the ability to survive the start up period, which may run into several years of low turnover and does not have the funds to get the business off to a good start, with better equipment, advertising, good location, or whatever it is that the chosen industry requires, for a new-boy to succeed.
This under funding is often born of the lack of industry knowledge. For example, hi-fi speakers are unacceptable in the recording studio, 'prosumer' cameras are unacceptable in a television studio and DIY tools are unacceptable in an auto repair shop.
In your case, knowing where to buy food (and it is never the local supermarket!) will be just one of many crippling stumbling blocks.
There is book that might help you, called 'Confessions of a Consultant - why some businesses really fail' by Andrew Graeme. There is a whole chapter on turning your hobby into another failed business! I cannot post a link to Amazon, as I do not have the necessary 30 posts to my credit to post a link here.
But the short form of my advice would be the same as 'Kulture's' advice above - you need to work in a good restaurant first.