Others may say; "what good is a plan if you have no money"? So which really is more important, money or plan? This is an example of the classic chicken and egg dilemma.
Same thing when people ask what's the best business to start. In my opinion, it's anything, as long as you have a clear plan and end goal in mind. Because it's not really about what business you want to be in, but the plan behind it that will determine if it will succeed, or fail.
To quote entrepreneur Jim Rohn:
I remember saying to my mentor, "If I had more money, I would have a better plan." He quickly responded, "I would suggest that if you had a better plan, you would have more money."
You see, it's not the amount that counts; it's the plan that counts.