I'd be thinking of doing whatever I'm good at. As for great ideas, there's not much new under the sun. Service is at a premium these days. As for compensation, if you're working in the wage economy, something without hassle. Happiness comes from meeting your own expectations and from those around you. Working for yourself isn't easy under the best of conditions, requiring patience and discipline, without a safety net, income up and down. The key is satisfaction from doing something well and having the respect of those around you.