But in order to actually be able to find a good concept, you need to figure out what your restaurant will stand for, what its added value could be and how it is going to differentiate itself from the competition. What you need to come up with is a unique selling point. For this, I strongly recommend a small competitive analysis beforehand which could provide an overview of the market and help you identify those potential gaps you could turn into opportunities.
Once you have all the data you need, you can start brainstorming for a concept with your business partners and even future employees, as well as for branding (naming, visual identity, value proposition etc.). Read more about brand identities and branding processes here.