That`s a tough question - like asking "I have some money to start a business - what business should I start?"
There`s no real answer - you have to find what fits your circumstance
I think you need to take a couple of things into consideration:
1. What can you allow yourself? Can you produce things? Can you store inventory? Do you have time to handle shipping and customer support around it?
If the answer isn`t a resounding yes you should definitely make use of utzjohn`s advice
2. What are you interested in? Tracy is 100% right - you are much less likely to get a business going and keeping it up if you have no interest in