You acquire skills and then start the business. Without skills, you won’t know if the idea is any good.

Like your idea could be to create and sell a software to design Lego builds, but without any skills in software development or law, you’d have no idea if that’s feasible programming wise, how much work it would be, or if Lego might sue you for trademark violation if you do that.

Ideas are easy, doing the stuff is hard.

Obviously you can outsource some parts, for example you could hire a lawyer to make sure you violate no trademark law, but when you don’t have much money, the reality is that you will start small and have to do most research and actual work (if not all) yourself.