Opening any business without experience or knowledge is little short of suicidal. This market is incredibly competitive so unless the concept is absolutely stand out then I'd give it a wide berth.

Having said that, I'd earnestly advise getting solid financial advice. I'd look for an accountant and/or lawyer with bags of experience and ask them a number of simple questions - eg: 

• What are the start up costs for the area in which you're thinking of operating?
• Are there untapped niches/specialties?
• What are the anticipated gross margins in this area?
• What are staff costs likely to work out at? 
• What are the typcial other overheads I need to consider?
• How do I control costs/wastage?
• Who are the most  popular suppliers in this area?
• What are the tax implications for employing staff - eg what's the law on tips?
  
• What is price competition like in the area?
• Is there demand for additional eating establishments in the area?
• What about location?