Congrats on the new idea! NDA's are a big part of the final steps before going forward into a laucnh. You'll need to put together at least an outline of a business plan so that you can show to potential investors. Keep in mind that investors like to be shown the pie in the sky. They don't want to have to imagine how something will work, or how numbers may play out. The more you have on paper (or even a working model), the easier it will be to bring those people on board.

Sign and date your idea and send it to your attorney so that you have a record of when you started working on the project. You can "poor man copyright" the idea also by putting it into an envelope and mailing it back to yourself, then don't open the envelope. This way if needed, you now have a timestamp from the postoffice etc. This works for VERY BASIC court cases

Wish I had the money to invest in your new ideas (depending on the idea of course), but if you ever wanted to bounce thoughts around and you're just looking for another ear for input, I'd be happy to talk to you and get you pumped up about your idea! Attitude and motivation are two of the biggest keys to success.