I am currently filing a patent, literally in the next few days I should have the application number. My advice would be get a good patent agent. My invention is in the field of furniture and is astonishingly simple (I would describe it in a few lines), the patent claims run to 24 pages.
The advice isn't cheap but what price do you put on protecting you ideas properly?
I know you are not in the UK, but have a look at this website -
http://www.ipo.gov.uk/
Find out if your country participates in the Patent Co-operation Treaty (PCT), this lets you file your patent in you own country and for a limited period of time that patent has protection in the participating countries. This, at least gives you a chance to file your idea relatively cheaply in your country leaving you time to find out it's commercial potential. Beware - once filed the clock is ticking and your idea is out there with long term protection only in the countries you have actually filed in. With respect to the countries you mention, I am sure they are within the PCT (also the UK and I think EU). I would imagine that if your country isn't the the treaty, then you should file in one that is (I am told the UK is relatively cheap for filing).
Before even starting the patent process I did a search through as many patent databases as I could find looking for prior-art, once that was done I paid for a search by a specialist. Only then did I engage my patent agent.
And don't tell us anything!!!!
Good luck!
By the way - a 'non disclosure agreement' is absolutely pointless. If you want a meeting with someone and ask them to sign, either you need to disclose what you are there for before they sign, or they sign to say you will be showing them 'something secret' that you will disclose at the meeting. Either way they can simply say - no deal, we already thought of that!
