First, figure out how to make money that you will use to fund realizing the idea.
New ideas have a tendency to be ridiculed and doubted so it may not be a good idea to depend on it to sustain the development.
You'll need other good ideas to sustain it. Other good ideas in terms of finance and making money. This is the long but sure (more realistic) path to realizing great ideas.
In terms of inventions that can be patented. A lot of things can be patented. But for patenting complex ones, again, you'll need money for that and especially time.
No shortcuts to doing things "right". As painful as it sounds, this is how our world works. It's actually slowing our technological progress and everything. We should be at the stars by now if it wasn't for people's greed and unreasonable fear of thinking out-of-the-box like they're going to hell if they did.