One good idea is all you need in order to attain success in any endeavor be it writing, creating ideas, being an innovator or what have you. The fast food concept is only an idea that was discovered by the right person who went on to be so successful that there are more than one imitator.
Out of all the ideas you may generate there will be one or in some cases more than one that will serve you needs. Start with the best idea and work from there in solving some problem or filling some important need.
You must also give yourself time to yourself in order to do much clear thinking, yes some periods of alone time to clear your mind and to get to know yourself better.