First off, it's important that you understand that ideas cannot be Copyrighted, and no lawyer on the planet is going to be able to help you get around that. Copyright is automatically assumed by the creator of any tangible work, be it books, games, whatever - it is not a legal process. Defending copyright against infringement, however, is a legal matter, and a potentially very expensive one at that.
An NDA is your best way forward, but even then if you don't have the money to deal with an infringement then the only purpose an NDA will serve, is that of a deterrent. If someone chooses to breach the NDA, what are you going to do about it?
To hire a group of programmers and game designers, you're going to need a large bag of cash. I don't know what Canada is like but where I come from, people don't like to work for free so you'll need to be paying them a salary, unless you agree payment on milestones achieved, but that's completely up to you to sort out. Profit share is an option but I don't think you're going to find anybody that will go for this unless you have a very good track record and proven sales stats because ultimately 50% of nothing, is still nothing.