If you have a project idea in mind and you know the right donor agency to apply, then it is fairly easy to come up with a proper concept note. So the first step here is your project idea!
For example, if you see extreme poverty around you and you wish to address this by introducing certain livelihood measures that will boost the income of the poor people, then this is your project idea.
You should then start searching for your donor agencies that can possibly fund your idea. It is easier to write the concept note after you have identified your donors because there are vast differences in their systems of accepting your project idea. Like mentioned earlier, some donors accept concept notes in certain format only while others just request a simple narration.
Further, donor interests will vary and it may not necessarily be the same as you think. So your concept note has to be moulded in such a manner that it draws the attention of the donor based upon mutual interests. For this to happen, you may need to research and learn more about your donor.
Where can I search for donors? FundsforNGOs Premium has an excellent donor database of thousands of donor profiles and you can search them using filter options such as Search by country or area of interest. You can learn more about it here.
Once you have successfully identified your donor agency and your project idea is ready, you can start working on your concept note.
