Regarding 'start up's:

I have a project idea that i think is pretty good and think could actually be useful to people and fill a niche, but:

* Nobody close to me I mentioned it to seems really interested.

* I am not 100% sure it would actually work/be useful/generate revenue/...

* I work full time and don't really want to invest my week-ends developing an idea I'm not sure will catch on.

What's the best next step? How do I evaluate my idea's chances? How can I get feedback without risking it getting stolen (very little chance but it would sting)