While you can do this to a degree, a business plan is far more complex than you may imagine involving accurate estimates of costs, and a marketing plan as well as the investors an their percentage of ownership as well as their specific investments. right now banks a loads of under performing small business loans and you would need to show both an educational background and the practical experience needed to make a go of such a venture. I do think working in the field is absolutely needed. This is a 18-20 hours a day business for a the owner. The failure rate is 57-61% in the first three years. This is a high risk low return opportunity for the bank unless it is a franchise which eliminates some of the risks.In every case you will have to have investment funds - some skin in the game so to speak to get to first base with any lender.
Sorry Dear, but no bank is just going to give you money to open a business. You have no experience, no equity and would be a poor risk. You need to gain experience in the catering and business trade for a few years.
I think you d be better off getting a job at a restaurant to get some experience of how things are run. Then you can try and save up some money, the bank will not accept you for a loan if you have no income at all.