Depends on what you want (Score 1)

If you want to market the software, that's one thing. But if you just want to have access to the software, that's another. In that case, start telling people about your idea, and if it's a good idea, it's likely you'll get some people interested.

If you want to market the idea, you're probably screwed unless you can put a lot of money into it up front. There are so many nonsense patent laws out there that you are almost certainly going to have someone screaming about "I have a patent on the OK button and another on scrolling a list of items" and such. If you can't afford the lawyers, you can't afford to go into the software business.